[PATCH 3.16 088/328] udl-kms: fix crash due to uninitialized memory

Ben Hutchings
2018-12-09T22:16:15Z

From: Mikulas Patocka <mpatocka@redhat.com>

commit 09a00abe3a9941c2715ca83eb88172cd2f54d8fd upstream.

We must use kzalloc when allocating the fb_deferred_io structure.
Otherwise, the field first_io is undefined and it causes a crash.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/gpu/drm/udl/udl_fb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -344,7 +344,7 @@ static int udl_fb_open(struct fb_info *i

struct fb_deferred_io *fbdefio;

- fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
+ fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);

if (fbdefio) {
fbdefio->delay = DL_DEFIO_WRITE_DELAY;