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Old 11-24-2011, 04:50 PM
Andy Whitcroft
Default hfs: add sanity check for file name length

From: Dan Carpenter <dan.carpenter@oracle.com>

On a corrupted file system the ->len field could be wrong leading to
a buffer overflow.

Reported-and-acked-by: Clement LECIGNE <clement.lecigne@netasq.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit bc5b8a9003132ae44559edd63a1623b7b99dfb68)
BugLink: http://bugs.launchpad.net/bugs/894374
Signed-off-by: Andy Whitcroft <apw@canonical.com>
fs/hfs/trans.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/hfs/trans.c b/fs/hfs/trans.c
index e673a88..b1ce4c7 100644
--- a/fs/hfs/trans.c
+++ b/fs/hfs/trans.c
@@ -40,6 +40,8 @@ int hfs_mac2asc(struct super_block *sb, char *out, const struct hfs_name *in)

src = in->name;
srclen = in->len;
+ if (srclen > HFS_NAMELEN)
+ srclen = HFS_NAMELEN;
dst = out;
if (nls_io) {

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