debugfs: convert to debugfs_file_get() and -put()
Convert all calls to the now obsolete debugfs_use_file_start() and
debugfs_use_file_finish() from the debugfs core itself to the new
debugfs_file_get() and debugfs_file_put() API.
Fixes: 49d200deaa ("debugfs: prevent access to removed files' private data")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolai Stange
Greg Kroah-Hartman
parent
055ab8e3e3
commit
69d29f9e6a
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@ -155,15 +155,12 @@ EXPORT_SYMBOL_GPL(debugfs_file_put);
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static int open_proxy_open(struct inode *inode, struct file *filp)
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{
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const struct dentry *dentry = F_DENTRY(filp);
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struct dentry *dentry = F_DENTRY(filp);
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const struct file_operations *real_fops = NULL;
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int srcu_idx, r;
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int r = 0;
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r = debugfs_use_file_start(dentry, &srcu_idx);
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if (r) {
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r = -ENOENT;
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goto out;
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}
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if (debugfs_file_get(dentry))
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return -ENOENT;
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real_fops = debugfs_real_fops(filp);
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real_fops = fops_get(real_fops);
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@ -180,7 +177,7 @@ static int open_proxy_open(struct inode *inode, struct file *filp)
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r = real_fops->open(inode, filp);
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out:
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debugfs_use_file_finish(srcu_idx);
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debugfs_file_put(dentry);
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return r;
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}
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@ -194,16 +191,16 @@ const struct file_operations debugfs_open_proxy_file_operations = {
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#define FULL_PROXY_FUNC(name, ret_type, filp, proto, args) \
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static ret_type full_proxy_ ## name(proto) \
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{ \
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const struct dentry *dentry = F_DENTRY(filp); \
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struct dentry *dentry = F_DENTRY(filp); \
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const struct file_operations *real_fops = \
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debugfs_real_fops(filp); \
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int srcu_idx; \
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ret_type r; \
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\
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r = debugfs_use_file_start(dentry, &srcu_idx); \
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if (likely(!r)) \
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r = debugfs_file_get(dentry); \
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if (unlikely(r)) \
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return r; \
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r = real_fops->name(args); \
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debugfs_use_file_finish(srcu_idx); \
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debugfs_file_put(dentry); \
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return r; \
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}
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@ -228,18 +225,15 @@ FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
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static unsigned int full_proxy_poll(struct file *filp,
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struct poll_table_struct *wait)
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{
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const struct dentry *dentry = F_DENTRY(filp);
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const struct file_operations *real_fops = debugfs_real_fops(filp);
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int srcu_idx;
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struct dentry *dentry = F_DENTRY(filp);
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unsigned int r = 0;
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if (debugfs_use_file_start(dentry, &srcu_idx)) {
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debugfs_use_file_finish(srcu_idx);
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if (debugfs_file_get(dentry))
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return POLLHUP;
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}
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r = real_fops->poll(filp, wait);
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debugfs_use_file_finish(srcu_idx);
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debugfs_file_put(dentry);
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return r;
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}
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@ -283,16 +277,13 @@ static void __full_proxy_fops_init(struct file_operations *proxy_fops,
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static int full_proxy_open(struct inode *inode, struct file *filp)
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{
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const struct dentry *dentry = F_DENTRY(filp);
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struct dentry *dentry = F_DENTRY(filp);
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const struct file_operations *real_fops = NULL;
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struct file_operations *proxy_fops = NULL;
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int srcu_idx, r;
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int r = 0;
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r = debugfs_use_file_start(dentry, &srcu_idx);
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if (r) {
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r = -ENOENT;
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goto out;
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}
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if (debugfs_file_get(dentry))
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return -ENOENT;
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real_fops = debugfs_real_fops(filp);
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real_fops = fops_get(real_fops);
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@ -330,7 +321,7 @@ free_proxy:
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kfree(proxy_fops);
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fops_put(real_fops);
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out:
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debugfs_use_file_finish(srcu_idx);
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debugfs_file_put(dentry);
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return r;
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}
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@ -341,13 +332,14 @@ const struct file_operations debugfs_full_proxy_file_operations = {
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ssize_t debugfs_attr_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct dentry *dentry = F_DENTRY(file);
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ssize_t ret;
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int srcu_idx;
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ret = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
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if (likely(!ret))
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ret = debugfs_file_get(dentry);
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if (unlikely(ret))
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return ret;
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ret = simple_attr_read(file, buf, len, ppos);
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debugfs_use_file_finish(srcu_idx);
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debugfs_file_put(dentry);
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return ret;
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}
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EXPORT_SYMBOL_GPL(debugfs_attr_read);
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@ -355,13 +347,14 @@ EXPORT_SYMBOL_GPL(debugfs_attr_read);
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ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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struct dentry *dentry = F_DENTRY(file);
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ssize_t ret;
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int srcu_idx;
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ret = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
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if (likely(!ret))
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ret = debugfs_file_get(dentry);
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if (unlikely(ret))
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return ret;
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ret = simple_attr_write(file, buf, len, ppos);
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debugfs_use_file_finish(srcu_idx);
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debugfs_file_put(dentry);
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return ret;
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}
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EXPORT_SYMBOL_GPL(debugfs_attr_write);
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@ -795,14 +788,14 @@ ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
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{
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char buf[3];
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bool val;
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int r, srcu_idx;
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int r;
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struct dentry *dentry = F_DENTRY(file);
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r = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
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if (likely(!r))
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val = *(bool *)file->private_data;
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debugfs_use_file_finish(srcu_idx);
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if (r)
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r = debugfs_file_get(dentry);
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if (unlikely(r))
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return r;
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val = *(bool *)file->private_data;
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debugfs_file_put(dentry);
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if (val)
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buf[0] = 'Y';
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@ -820,8 +813,9 @@ ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
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char buf[32];
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size_t buf_size;
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bool bv;
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int r, srcu_idx;
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int r;
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bool *val = file->private_data;
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struct dentry *dentry = F_DENTRY(file);
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buf_size = min(count, (sizeof(buf)-1));
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if (copy_from_user(buf, user_buf, buf_size))
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@ -829,12 +823,11 @@ ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
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buf[buf_size] = '\0';
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if (strtobool(buf, &bv) == 0) {
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r = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
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if (likely(!r))
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*val = bv;
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debugfs_use_file_finish(srcu_idx);
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if (r)
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r = debugfs_file_get(dentry);
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if (unlikely(r))
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return r;
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*val = bv;
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debugfs_file_put(dentry);
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}
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return count;
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@ -896,14 +889,15 @@ static ssize_t read_file_blob(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct debugfs_blob_wrapper *blob = file->private_data;
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struct dentry *dentry = F_DENTRY(file);
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ssize_t r;
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int srcu_idx;
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r = debugfs_use_file_start(F_DENTRY(file), &srcu_idx);
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if (likely(!r))
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r = debugfs_file_get(dentry);
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if (unlikely(r))
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return r;
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r = simple_read_from_buffer(user_buf, count, ppos, blob->data,
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blob->size);
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debugfs_use_file_finish(srcu_idx);
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debugfs_file_put(dentry);
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return r;
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}
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