diff options
| author | Timo Warns <Warns@pre-sense.de> | 2011-05-19 09:24:17 +0200 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-06-26 12:47:16 -0400 |
| commit | 9fc10a22e5020046d6a904743720b41647a54120 (patch) | |
| tree | d4167efb2b5d909bd2d3a21316d64a400158e9ca | |
| parent | ae8b12304fac6a3f34aeffbb09608f412f583b2d (diff) | |
Fix for buffer overflow in ldm_frag_add not sufficient
commit cae13fe4cc3f24820ffb990c09110626837e85d4 upstream.
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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -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 a2a14cd48a8..dd6efdba939 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 */ |