drm/radeon/kms: Fix oops after radeon_cs_parser_init() failure.

If radeon_cs_parser_init() fails, radeon_cs_ioctl() calls
radeon_cs_parser_fini() with the non-zero error value. The latter dereferenced
parser->ib which hasn't been initialized yet -> boom. Add a test for parser->ib
being non-NULL before dereferencing it.

Signed-off-by: Michel Dänzer <daenzer@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 1496cb8658ef..1190148cf5e6 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -189,7 +189,7 @@ static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error)
 {
         unsigned i;
 
-        if (error) {
+        if (error && parser->ib) {
                 radeon_bo_list_unvalidate(&parser->validated,
                                                 parser->ib->fence);
         } else {