diff options
| author | Timo Warns <Warns@pre-sense.de> | 2011-02-25 14:44:21 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-02 09:47:05 -0500 |
| commit | 9723799aad5d12ac9eb833bdc5abd19b91a3bd67 (patch) | |
| tree | 4875024650401bec3862610ba6280d9c59d551b3 /fs/partitions | |
| parent | 484d82b6e2e4239ba7a722e0c532e9aff64be51a (diff) | |
ldm: corrupted partition table can cause kernel oops
commit 294f6cf48666825d23c9372ef37631232746e40d upstream.
The kernel automatically evaluates partition tables of storage devices.
The code for evaluating LDM partitions (in fs/partitions/ldm.c) contains
a bug that causes a kernel oops on certain corrupted LDM partitions. A
kernel subsystem seems to crash, because, after the oops, the kernel no
longer recognizes newly connected storage devices.
The patch changes ldm_parse_vmdb() to Validate the value of vblk_size.
Signed-off-by: Timo Warns <warns@pre-sense.de>
Cc: Eugene Teo <eugeneteo@kernel.sg>
Acked-by: Richard Russon <ldm@flatcap.org>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/partitions')
| -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 8652fb99e96..2cd9e43cc27 100644 --- a/fs/partitions/ldm.c +++ b/fs/partitions/ldm.c @@ -251,6 +251,11 @@ static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm) } vm->vblk_size = get_unaligned_be32(data + 0x08); + if (vm->vblk_size == 0) { + ldm_error ("Illegal VBLK size"); + return false; + } + vm->vblk_offset = get_unaligned_be32(data + 0x0C); vm->last_vblk_seq = get_unaligned_be32(data + 0x04); |