From 294f6cf48666825d23c9372ef37631232746e40d Mon Sep 17 00:00:00 2001 From: Timo Warns Date: Fri, 25 Feb 2011 14:44:21 -0800 Subject: ldm: corrupted partition table can cause kernel oops 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 Cc: Eugene Teo Acked-by: Richard Russon Cc: Harvey Harrison Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/partitions/ldm.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'fs/partitions') diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c index 789c625c7aa..b10e3540d5b 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); -- cgit v1.2.3-70-g09d2