The return value of kzalloc() needs to be checked. To avoid use of null pointer '&ast_state->base' in case of the failure of alloc.
Fixes: f0adbc382b8b ("drm/ast: Allocate initial CRTC state of the correct size") Signed-off-by: Jiasheng Jiang jiasheng@iscas.ac.cn --- Changelog:
v1 -> v2
*Change 1. Add the else statement that calling __drm_atomic_helper_crtc_reset() with a state of NULL. --- drivers/gpu/drm/ast/ast_mode.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index 36d9575aa27b..65099f0359f9 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -1120,7 +1120,10 @@ static void ast_crtc_reset(struct drm_crtc *crtc) if (crtc->state) crtc->funcs->atomic_destroy_state(crtc, crtc->state);
- __drm_atomic_helper_crtc_reset(crtc, &ast_state->base); + if (ast_state) + __drm_atomic_helper_crtc_reset(crtc, &ast_state->base); + else + __drm_atomic_helper_crtc_reset(crtc, NULL); }
static struct drm_crtc_state *