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libceph: fix overflow in osdmap_decode()

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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>
This commit is contained in:
Xi Wang 2012-06-06 19:35:55 -05:00 committed by Alex Elder
parent ad3b904c07
commit e91a9b639a
1 changed files with 3 additions and 0 deletions
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3
net/ceph/osdmap.c
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@ -667,6 +667,9 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
ceph_decode_copy(p, &pgid, sizeof(pgid));
n = ceph_decode_32(p);
err = -EINVAL;
if (n > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
goto bad;
ceph_decode_need(p, end, n * sizeof(u32), bad);
err = -ENOMEM;
pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);