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linux-sg2042
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ovl: clean up copy-up error paths 

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-05-31 11:06:11 +02:00
parent dd8ac699ed
commit b148cba403
1 changed files with 18 additions and 36 deletions
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54
fs/overlayfs/copy_up.c
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@ -366,12 +366,13 @@ static int ovl_create_index(struct dentry *dentry, struct dentry *origin,
return err; return err;
temp = ovl_create_temp(indexdir, OVL_CATTR(S_IFDIR | 0)); temp = ovl_create_temp(indexdir, OVL_CATTR(S_IFDIR | 0));
err = PTR_ERR(temp);
if (IS_ERR(temp)) if (IS_ERR(temp))
goto temp_err; goto free_name;
err = ovl_set_upper_fh(upper, temp); err = ovl_set_upper_fh(upper, temp);
if (err) if (err)
goto out_cleanup; goto out;
index = lookup_one_len(name.name, indexdir, name.len); index = lookup_one_len(name.name, indexdir, name.len);
if (IS_ERR(index)) { if (IS_ERR(index)) {
@ -380,23 +381,13 @@ static int ovl_create_index(struct dentry *dentry, struct dentry *origin,
err = ovl_do_rename(dir, temp, dir, index, 0); err = ovl_do_rename(dir, temp, dir, index, 0);
dput(index); dput(index);
} }
if (err)
goto out_cleanup;
out: out:
if (err)
ovl_cleanup(dir, temp);
dput(temp); dput(temp);
free_name:
kfree(name.name); kfree(name.name);
return err; return err;
temp_err:
err = PTR_ERR(temp);
temp = NULL;
goto out;
out_cleanup:
ovl_cleanup(dir, temp);
goto out;
} }
struct ovl_copy_up_ctx { struct ovl_copy_up_ctx {
@ -476,7 +467,7 @@ static int ovl_install_temp(struct ovl_copy_up_ctx *c, struct dentry *temp,
return err; return err;
} }
static int ovl_get_tmpfile(struct ovl_copy_up_ctx *c, struct dentry **tempp) static struct dentry *ovl_get_tmpfile(struct ovl_copy_up_ctx *c)
{ {
int err; int err;
struct dentry *temp; struct dentry *temp;
@ -490,6 +481,7 @@ static int ovl_get_tmpfile(struct ovl_copy_up_ctx *c, struct dentry **tempp)
}; };
err = security_inode_copy_up(c->dentry, &new_creds); err = security_inode_copy_up(c->dentry, &new_creds);
temp = ERR_PTR(err);
if (err < 0) if (err < 0)
goto out; goto out;
@ -500,21 +492,13 @@ static int ovl_get_tmpfile(struct ovl_copy_up_ctx *c, struct dentry **tempp)
temp = ovl_do_tmpfile(c->workdir, c->stat.mode); temp = ovl_do_tmpfile(c->workdir, c->stat.mode);
else else
temp = ovl_create_temp(c->workdir, &cattr); temp = ovl_create_temp(c->workdir, &cattr);
if (IS_ERR(temp))
goto temp_err;
err = 0;
*tempp = temp;
out: out:
if (new_creds) { if (new_creds) {
revert_creds(old_creds); revert_creds(old_creds);
put_cred(new_creds); put_cred(new_creds);
} }
return err; return temp;
temp_err:
err = PTR_ERR(temp);
goto out;
} }
static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp) static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
@ -564,21 +548,21 @@ static int ovl_copy_up_locked(struct ovl_copy_up_ctx *c)
struct inode *udir = c->destdir->d_inode; struct inode *udir = c->destdir->d_inode;
struct inode *inode; struct inode *inode;
struct dentry *newdentry = NULL; struct dentry *newdentry = NULL;
struct dentry *temp = NULL; struct dentry *temp;
int err; int err;
err = ovl_get_tmpfile(c, &temp); temp = ovl_get_tmpfile(c);
if (err) if (IS_ERR(temp))
goto out; return PTR_ERR(temp);
err = ovl_copy_up_inode(c, temp); err = ovl_copy_up_inode(c, temp);
if (err) if (err)
goto out_cleanup; goto out;
if (S_ISDIR(c->stat.mode) && c->indexed) { if (S_ISDIR(c->stat.mode) && c->indexed) {
err = ovl_create_index(c->dentry, c->lowerpath.dentry, temp); err = ovl_create_index(c->dentry, c->lowerpath.dentry, temp);
if (err) if (err)
goto out_cleanup; goto out;
} }
if (c->tmpfile) { if (c->tmpfile) {
@ -589,7 +573,7 @@ static int ovl_copy_up_locked(struct ovl_copy_up_ctx *c)
err = ovl_install_temp(c, temp, &newdentry); err = ovl_install_temp(c, temp, &newdentry);
} }
if (err) if (err)
goto out_cleanup; goto out;
inode = d_inode(c->dentry); inode = d_inode(c->dentry);
ovl_inode_update(inode, newdentry); ovl_inode_update(inode, newdentry);
@ -597,13 +581,11 @@ static int ovl_copy_up_locked(struct ovl_copy_up_ctx *c)
ovl_set_flag(OVL_WHITEOUTS, inode); ovl_set_flag(OVL_WHITEOUTS, inode);
out: out:
if (err && !c->tmpfile)
ovl_cleanup(d_inode(c->workdir), temp);
dput(temp); dput(temp);
return err; return err;
out_cleanup:
if (!c->tmpfile)
ovl_cleanup(d_inode(c->workdir), temp);
goto out;
} }
/* /*