diff options
| author | Timo Warns <Warns@pre-sense.de> | 2011-05-19 09:24:17 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-20 16:40:36 -0700 |
| commit | cae13fe4cc3f24820ffb990c09110626837e85d4 (patch) | |
| tree | db3722f6c3ffc142eb3b931fb41b34d8dab3eaa7 | |
| parent | e6c9366b2adb52cba64b359b3050200743c7568c (diff) | |
| download | lwn-cae13fe4cc3f24820ffb990c09110626837e85d4.tar.gz lwn-cae13fe4cc3f24820ffb990c09110626837e85d4.zip | |
Fix for buffer overflow in ldm_frag_add not sufficient
As Ben Hutchings discovered [1], the patch for CVE-2011-1017 (buffer
overflow in ldm_frag_add) is not sufficient. The original patch in
commit c340b1d64000 ("fs/partitions/ldm.c: fix oops caused by corrupted
partition table") does not consider that, for subsequent fragments,
previously allocated memory is used.
[1] http://lkml.org/lkml/2011/5/6/407
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Timo Warns <warns@pre-sense.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/partitions/ldm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c index ce4f62440425..a29d5ccf3d54 100644 --- a/fs/partitions/ldm.c +++ b/fs/partitions/ldm.c @@ -1335,6 +1335,11 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) list_add_tail (&f->list, frags); found: + if (rec >= f->num) { + ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num); + return false; + } + if (f->map & (1 << rec)) { ldm_error ("Duplicate VBLK, part %d.", rec); f->map &= 0x7F; /* Mark the group as broken */ |