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authorLepton Wu <ytht.net@gmail.com>2007-10-16 23:29:50 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:57 -0700
commit80eb68d23897126e7f25e2b3689bc27fb8cdde17 (patch)
treef054c849b1e8856912050342fcb27d83a6f42830 /fs/reiserfs/dir.c
parenta6cd6bf9f8cab154a4a086fe786bd7422954d8dc (diff)
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reiserfs: fix kernel panic on corrupted directory
When reading corrupted reiserfs directory data, d_reclen could be a negative number or a big positive number, this can lead to kernel panic or oop. The following patch adds a sanity check. Signed-off-by: Lepton Wu <ytht.net@gmail.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Jeff Mahoney <jeffm@suse.com> Cc: "Vladimir V. Saveliev" <vs@namesys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/reiserfs/dir.c')
-rw-r--r--fs/reiserfs/dir.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index ffbfc2caaf2..e6b03d2020c 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -121,6 +121,16 @@ static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
continue;
d_reclen = entry_length(bh, ih, entry_num);
d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
+
+ if (d_reclen <= 0 ||
+ d_name + d_reclen > bh->b_data + bh->b_size) {
+ /* There is corrupted data in entry,
+ * We'd better stop here */
+ pathrelse(&path_to_entry);
+ ret = -EIO;
+ goto out;
+ }
+
if (!d_name[d_reclen - 1])
d_reclen = strlen(d_name);