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cifs: don't cargo-cult strndup() 

strndup(s, strlen(s)) is a highly unidiomatic way to spell strdup(s);
it's *NOT* safer in any way, since strlen() is just as sensitive to
NUL-termination as strdup() is.

strndup() is for situations when you need a copy of a known-sized
substring, not a magic security juju to drive the bad spirits away.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Al Viro 2021-03-05 15:02:34 -05:00 committed by Steve French
parent b9335f6210
commit 8d76722355
7 changed files with 17 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/cifs/cifs_dfs_ref.c
View File

@ -270,7 +270,7 @@ static struct vfsmount *cifs_dfs_do_mount(struct dentry *mntpt,
char *mountdata;
char *devname;
devname = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
devname = kstrdup(fullpath, GFP_KERNEL);
if (!devname)
return ERR_PTR(-ENOMEM);

9
fs/cifs/connect.c
View File

@ -1778,9 +1778,7 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
* for the request.
*/
if (is_domain && ses->domainName) {
ctx->domainname = kstrndup(ses->domainName,
strlen(ses->domainName),
GFP_KERNEL);
ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
if (!ctx->domainname) {
cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
len);
@ -3411,8 +3409,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
goto error;
}
/* Save mount options */
mntdata = kstrndup(cifs_sb->ctx->mount_options,
strlen(cifs_sb->ctx->mount_options), GFP_KERNEL);
mntdata = kstrdup(cifs_sb->ctx->mount_options, GFP_KERNEL);
if (!mntdata) {
rc = -ENOMEM;
goto error;
@ -3485,7 +3482,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
* links, the prefix path is included in both and may be changed during reconnect. See
* cifs_tree_connect().
*/
cifs_sb->origin_fullpath = kstrndup(full_path, strlen(full_path), GFP_KERNEL);
cifs_sb->origin_fullpath = kstrdup(full_path, GFP_KERNEL);
if (!cifs_sb->origin_fullpath) {
rc = -ENOMEM;
goto error;

18
fs/cifs/dfs_cache.c
View File

@ -89,7 +89,7 @@ static int get_normalized_path(const char *path, char **npath)
if (*path == '\\') {
*npath = (char *)path;
} else {
*npath = kstrndup(path, strlen(path), GFP_KERNEL);
*npath = kstrdup(path, GFP_KERNEL);
if (!*npath)
return -ENOMEM;
convert_delimiter(*npath, '\\');
@ -358,7 +358,7 @@ static struct cache_dfs_tgt *alloc_target(const char *name, int path_consumed)
t = kmalloc(sizeof(*t), GFP_ATOMIC);
if (!t)
return ERR_PTR(-ENOMEM);
t->name = kstrndup(name, strlen(name), GFP_ATOMIC);
t->name = kstrdup(name, GFP_ATOMIC);
if (!t->name) {
kfree(t);
return ERR_PTR(-ENOMEM);
@ -419,7 +419,7 @@ static struct cache_entry *alloc_cache_entry(const char *path,
if (!ce)
return ERR_PTR(-ENOMEM);
ce->path = kstrndup(path, strlen(path), GFP_KERNEL);
ce->path = kstrdup(path, GFP_KERNEL);
if (!ce->path) {
kmem_cache_free(cache_slab, ce);
return ERR_PTR(-ENOMEM);
@ -531,7 +531,7 @@ static struct cache_entry *lookup_cache_entry(const char *path, unsigned int *ha
char *s, *e;
char sep;
npath = kstrndup(path, strlen(path), GFP_KERNEL);
npath = kstrdup(path, GFP_KERNEL);
if (!npath)
return ERR_PTR(-ENOMEM);
@ -641,7 +641,7 @@ static int __update_cache_entry(const char *path,
if (ce->tgthint) {
s = ce->tgthint->name;
th = kstrndup(s, strlen(s), GFP_ATOMIC);
th = kstrdup(s, GFP_ATOMIC);
if (!th)
return -ENOMEM;
}
@ -786,11 +786,11 @@ static int setup_referral(const char *path, struct cache_entry *ce,
memset(ref, 0, sizeof(*ref));
ref->path_name = kstrndup(path, strlen(path), GFP_ATOMIC);
ref->path_name = kstrdup(path, GFP_ATOMIC);
if (!ref->path_name)
return -ENOMEM;
ref->node_name = kstrndup(target, strlen(target), GFP_ATOMIC);
ref->node_name = kstrdup(target, GFP_ATOMIC);
if (!ref->node_name) {
rc = -ENOMEM;
goto err_free_path;
@ -828,7 +828,7 @@ static int get_targets(struct cache_entry *ce, struct dfs_cache_tgt_list *tl)
goto err_free_it;
}
it->it_name = kstrndup(t->name, strlen(t->name), GFP_ATOMIC);
it->it_name = kstrdup(t->name, GFP_ATOMIC);
if (!it->it_name) {
kfree(it);
rc = -ENOMEM;
@ -1166,7 +1166,7 @@ int dfs_cache_add_vol(char *mntdata, struct smb3_fs_context *ctx, const char *fu
if (!vi)
return -ENOMEM;
vi->fullpath = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
vi->fullpath = kstrdup(fullpath, GFP_KERNEL);
if (!vi->fullpath) {
rc = -ENOMEM;
goto err_free_vi;

2
fs/cifs/fs_context.c
View File

@ -430,7 +430,7 @@ int smb3_parse_opt(const char *options, const char *key, char **val)
if (nval == p)
continue;
*nval++ = 0;
*val = kstrndup(nval, strlen(nval), GFP_KERNEL);
*val = kstrdup(nval, GFP_KERNEL);
rc = !*val ? -ENOMEM : 0;
goto out;
}

2
fs/cifs/misc.c
View File

@ -1180,7 +1180,7 @@ int update_super_prepath(struct cifs_tcon *tcon, char *prefix)
kfree(cifs_sb->prepath);
if (prefix && *prefix) {
cifs_sb->prepath = kstrndup(prefix, strlen(prefix), GFP_ATOMIC);
cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC);
if (!cifs_sb->prepath) {
rc = -ENOMEM;
goto out;

4
fs/cifs/smb1ops.c
View File

@ -926,9 +926,7 @@ cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
0);
if (!rc) {
*symlinkinfo = kstrndup(referral.node_name,
strlen(referral.node_name),
GFP_KERNEL);
*symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL);
free_dfs_info_param(&referral);
if (!*symlinkinfo)
rc = -ENOMEM;

4
fs/cifs/unc.c
View File

@ -50,7 +50,6 @@ char *extract_sharename(const char *unc)
{
const char *src;
char *delim, *dst;
int len;
/* skip double chars at the beginning */
src = unc + 2;
@ -60,10 +59,9 @@ char *extract_sharename(const char *unc)
if (!delim)
return ERR_PTR(-EINVAL);
delim++;
len = strlen(delim);
/* caller has to free the memory */
dst = kstrndup(delim, len, GFP_KERNEL);
dst = kstrdup(delim, GFP_KERNEL);
if (!dst)
return ERR_PTR(-ENOMEM);