From cae13fe4cc3f24820ffb990c09110626837e85d4 Mon Sep 17 00:00:00 2001 From: Timo Warns Date: Thu, 19 May 2011 09:24:17 +0200 Subject: [PATCH] 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 Signed-off-by: Timo Warns Signed-off-by: Linus Torvalds --- fs/partitions/ldm.c | 5 +++++ 1 file changed, 5 insertions(+) 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 */ -- 2.20.1