From ff4bd0827764e10a428a9d39e6814c5478863f94 Mon Sep 17 00:00:00 2001 From: Ilija Hadzic Date: Mon, 7 Jan 2013 18:21:57 -0500 Subject: [PATCH] drm/radeon: fix NULL pointer dereference in UMS mode In UMS mode parser->rdev is NULL, so dereferencing will cause an oops. Signed-off-by: Ilija Hadzic Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/radeon_cs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c index 396baba..45151c4 100644 --- a/drivers/gpu/drm/radeon/radeon_cs.c +++ b/drivers/gpu/drm/radeon/radeon_cs.c @@ -279,7 +279,7 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data) p->chunks[p->chunk_ib_idx].length_dw); return -EINVAL; } - if ((p->rdev->flags & RADEON_IS_AGP)) { + if (p->rdev && (p->rdev->flags & RADEON_IS_AGP)) { p->chunks[p->chunk_ib_idx].kpage[0] = kmalloc(PAGE_SIZE, GFP_KERNEL); p->chunks[p->chunk_ib_idx].kpage[1] = kmalloc(PAGE_SIZE, GFP_KERNEL); if (p->chunks[p->chunk_ib_idx].kpage[0] == NULL || @@ -583,7 +583,8 @@ static int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx) struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx]; int i; int size = PAGE_SIZE; - bool copy1 = (p->rdev->flags & RADEON_IS_AGP) ? false : true; + bool copy1 = (p->rdev && (p->rdev->flags & RADEON_IS_AGP)) ? + false : true; for (i = ibc->last_copied_page + 1; i < pg_idx; i++) { if (DRM_COPY_FROM_USER(p->ib.ptr + (i * (PAGE_SIZE/4)), -- 2.7.4