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authorDan Carpenter <dan.carpenter@oracle.com>2011-11-04 21:24:08 +0300
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-11-16 12:13:47 -0500
commit21643e69a4c06f7ef155fbc70e3fba13fba4a756 (patch)
tree8ab4fce440977edd5508abed992022674dec9d77 /drivers/xen
parentfc6e0c3b909157748ce1c0c0f2a9935a5ee3c812 (diff)
downloadop-kernel-dev-21643e69a4c06f7ef155fbc70e3fba13fba4a756.zip
op-kernel-dev-21643e69a4c06f7ef155fbc70e3fba13fba4a756.tar.gz
xen-gntalloc: integer overflow in gntalloc_ioctl_alloc()
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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/gntalloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index f6832f4..23c60cf 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -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;
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