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Subject[PATCH 1/2] [media] v4l2-ctrls: fix integer overflow in v4l2_g_ext_ctrls()
Date
A large cs->count from userspace may overflow the allocation size,
leading to memory corruption. v4l2_g_ext_ctrls() can be reached
from subdev_do_ioctl() or __video_do_ioctl().

Use kmalloc_array() to avoid the overflow.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
---
drivers/media/video/v4l2-ctrls.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index 18015c0..f355fd5 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -1996,7 +1996,8 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
return class_check(hdl, cs->ctrl_class);

if (cs->count > ARRAY_SIZE(helper)) {
- helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
+ helpers = kmalloc_array(cs->count, sizeof(helper[0]),
+ GFP_KERNEL);
if (helpers == NULL)
return -ENOMEM;
}
--
1.7.5.4


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