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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2011-11-04 22:24:08 +0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-11-16 21:13:47 +0400 |
| commit | 21643e69a4c06f7ef155fbc70e3fba13fba4a756 (patch) | |
| tree | 8ab4fce440977edd5508abed992022674dec9d77 | |
| parent | fc6e0c3b909157748ce1c0c0f2a9935a5ee3c812 (diff) | |
| download | linux-21643e69a4c06f7ef155fbc70e3fba13fba4a756.tar.xz | |
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>
| -rw-r--r-- | drivers/xen/gntalloc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c index f6832f46aea4..23c60cf4313e 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; |