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| author | Erez Zadok <ezk@fsl.cs.sunysb.edu> | 2011-05-21 01:19:59 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-21 00:12:16 -0700 |
| commit | 1a4022f88d40e1255920b017556092ab926d7f66 (patch) | |
| tree | f4e54841dae0ecf1324a3002bc540f8b6ba441d5 /fs/namei.c | |
| parent | 052497553e5dedc04c43800820c1d5788201cc71 (diff) | |
| download | lwn-1a4022f88d40e1255920b017556092ab926d7f66.tar.gz lwn-1a4022f88d40e1255920b017556092ab926d7f66.zip | |
VFS: move BUG_ON test for symlink nd->depth after current->link_count test
This solves a serious VFS-level bug in nested_symlink (which was
rewritten from do_follow_link), and follows the order of depth tests
that existed before.
The bug triggers a BUG_ON in fs/namei.c:1381, when running racer with
symlink and rename ops.
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Acked-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/namei.c b/fs/namei.c index e3c4f112ebf7..6ff858c049c0 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1378,12 +1378,12 @@ static inline int nested_symlink(struct path *path, struct nameidata *nd) { int res; - BUG_ON(nd->depth >= MAX_NESTED_LINKS); if (unlikely(current->link_count >= MAX_NESTED_LINKS)) { path_put_conditional(path, nd); path_put(&nd->path); return -ELOOP; } + BUG_ON(nd->depth >= MAX_NESTED_LINKS); nd->depth++; current->link_count++; |