libceph: fix overflow in osdmap_decode()
authorXi Wang <xi.wang@gmail.com>
Thu, 7 Jun 2012 00:35:55 +0000 (19:35 -0500)
committerAlex Elder <elder@dreamhost.com>
Thu, 7 Jun 2012 13:28:10 +0000 (08:28 -0500)
commite91a9b639a691e0982088b5954eaafb5a25c8f1c
tree3ffdd2430ba72fefa9d8fb7eef73625d395de01d
parentad3b904c07dfa88603689bf9a67bffbb9b99beb5
libceph: fix overflow in osdmap_decode()

On 32-bit systems, a large `n' would overflow `n * sizeof(u32)' and bypass
the check ceph_decode_need(p, end, n * sizeof(u32), bad).  It would also
overflow the subsequent kmalloc() size, leading to out-of-bounds write.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Alex Elder <elder@inktank.com>
net/ceph/osdmap.c