diff options
| author | Miklos Szeredi <[email protected]> | 2017-06-28 13:41:22 +0200 |
|---|---|---|
| committer | Miklos Szeredi <[email protected]> | 2017-06-28 13:41:22 +0200 |
| commit | e85f82ff9b8ef503923a3be8ca6b5fd1908a7f3f (patch) | |
| tree | 7c0b05231e998562d9fe83c41568f8f11ea480a6 | |
| parent | c0bc126f97fb929b3ae02c1c62322645d70eb408 (diff) | |
ovl: copy-up: don't unlock between lookup and link
Nothing prevents mischief on upper layer while we are busy copying up the
data.
Move the lookup right before the looked up dentry is actually used.
Signed-off-by: Miklos Szeredi <[email protected]>
Fixes: 01ad3eb8a073 ("ovl: concurrent copy up of regular files")
Cc: <[email protected]> # v4.11
| -rw-r--r-- | fs/overlayfs/copy_up.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 7a44533f4bbf..ded8bfeb193e 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -330,15 +330,9 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, .link = link }; - upper = lookup_one_len(dentry->d_name.name, upperdir, - dentry->d_name.len); - err = PTR_ERR(upper); - if (IS_ERR(upper)) - goto out; - err = security_inode_copy_up(dentry, &new_creds); if (err < 0) - goto out1; + goto out; if (new_creds) old_creds = override_creds(new_creds); @@ -362,7 +356,7 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, } if (err) - goto out2; + goto out; if (S_ISREG(stat->mode)) { struct path upperpath; @@ -403,6 +397,14 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, if (err) goto out_cleanup; + upper = lookup_one_len(dentry->d_name.name, upperdir, + dentry->d_name.len); + if (IS_ERR(upper)) { + err = PTR_ERR(upper); + upper = NULL; + goto out_cleanup; + } + if (tmpfile) err = ovl_do_link(temp, udir, upper, true); else @@ -416,17 +418,15 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, /* Restore timestamps on parent (best effort) */ ovl_set_timestamps(upperdir, pstat); -out2: +out: dput(temp); -out1: dput(upper); -out: return err; out_cleanup: if (!tmpfile) ovl_cleanup(wdir, temp); - goto out2; + goto out; } /* |