From: Marek Szyprowski Date: Wed, 12 Oct 2011 16:09:53 +0000 (-0300) Subject: [media] media: vb2: add a check for uninitialized buffer X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2c2dd6ac738d8a22def46e073fb7383cac8fa180;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [media] media: vb2: add a check for uninitialized buffer __buffer_in_use() might be called for empty/uninitialized buffer in the following scenario: REQBUF(n, USER_PTR), QUERYBUF(). This patch fixes kernel ops in such case. Signed-off-by: Marek Szyprowski Signed-off-by: Kyungmin Park CC: Pawel Osciak Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c index 979e544388cb..9bb92145ad5a 100644 --- a/drivers/media/video/videobuf2-core.c +++ b/drivers/media/video/videobuf2-core.c @@ -296,14 +296,14 @@ static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) { unsigned int plane; for (plane = 0; plane < vb->num_planes; ++plane) { + void *mem_priv = vb->planes[plane].mem_priv; /* * If num_users() has not been provided, call_memop * will return 0, apparently nobody cares about this * case anyway. If num_users() returns more than 1, * we are not the only user of the plane's memory. */ - if (call_memop(q, plane, num_users, - vb->planes[plane].mem_priv) > 1) + if (mem_priv && call_memop(q, plane, num_users, mem_priv) > 1) return true; } return false;