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xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()

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On 32 bit systems a high value of op.count could lead to an integer
overflow in the kzalloc() and gref_ids would be smaller than
expected.  If the you triggered another integer overflow in
"if (gref_size + op.count > limit)" then you'd probably get memory
corruption inside add_grefs().

CC: stable@kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Dan Carpenter 2011-11-04 21:24:08 +03:00 committed by Konrad Rzeszutek Wilk
parent fc6e0c3b90
commit 21643e69a4
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/gntalloc.c
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@ -280,7 +280,7 @@ static long gntalloc_ioctl_alloc(struct gntalloc_file_private_data *priv,
goto out;
}
gref_ids = kzalloc(sizeof(gref_ids[0]) * op.count, GFP_TEMPORARY);
gref_ids = kcalloc(op.count, sizeof(gref_ids[0]), GFP_TEMPORARY);
if (!gref_ids) {
rc = -ENOMEM;
goto out;