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fs/mount_setattr: always cleanup mount_kattr

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Make sure that finish_mount_kattr() is called after mount_kattr was
succesfully built in both the success and failure case to prevent
leaking any references we took when we built it.  We returned early if
path lookup failed thereby risking to leak an additional reference we
took when building mount_kattr when an idmapped mount was requested.

Cc: linux-fsdevel@vger.kernel.org
Cc: stable@vger.kernel.org
Fixes: 9caccd41541a ("fs: introduce MOUNT_ATTR_IDMAP")
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christian Brauner 2021-12-30 20:23:09 +01:00 committed by Linus Torvalds
parent 74c78b4291
commit 012e332286
1 changed files with 4 additions and 5 deletions
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9
fs/namespace.c
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@ -4263,12 +4263,11 @@ SYSCALL_DEFINE5(mount_setattr, int, dfd, const char __user *, path,
return err;
err = user_path_at(dfd, path, kattr.lookup_flags, &target);
if (err)
return err;
err = do_mount_setattr(&target, &kattr);
if (!err) {
err = do_mount_setattr(&target, &kattr);
path_put(&target);
}
finish_mount_kattr(&kattr);
path_put(&target);
return err;
}