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authorAndrey Ryabinin <a.ryabinin@samsung.com>2015-05-25 13:29:44 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-05-26 17:31:52 +0200
commit60f207a5b6d8f23c2e8388b415e8d5c7311cc79d (patch)
tree222c8cbf96f442329c2dc37ae7a986bc5e7e4c12 /include/drm
parent955f3c334f0fb2b843efad5cc6d3b7e141e9d666 (diff)
downloadlinux-linaro-stable-60f207a5b6d8f23c2e8388b415e8d5c7311cc79d.tar.gz
drm/atomic: fix out of bounds read in for_each_*_in_state helpers
for_each_*_in_state validate array index after access to array elements, thus perform out of bounds read. Fix this by validating index in the first place and read array element iff validation was successful. Fixes: df63b9994eaf ("drm/atomic: Add for_each_{connector,crtc,plane}_in_state helper macros") Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_atomic.h24
1 files changed, 12 insertions, 12 deletions
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 55f46049e4a0..1bbfedf466b9 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -142,26 +142,26 @@ int __must_check drm_atomic_async_commit(struct drm_atomic_state *state);
#define for_each_connector_in_state(state, connector, connector_state, __i) \
for ((__i) = 0; \
- (connector) = (state)->connectors[__i], \
- (connector_state) = (state)->connector_states[__i], \
- (__i) < (state)->num_connector; \
+ (__i) < (state)->num_connector && \
+ ((connector) = (state)->connectors[__i], \
+ (connector_state) = (state)->connector_states[__i], 1); \
(__i)++) \
if (connector)
#define for_each_crtc_in_state(state, crtc, crtc_state, __i) \
for ((__i) = 0; \
- (crtc) = (state)->crtcs[__i], \
- (crtc_state) = (state)->crtc_states[__i], \
- (__i) < (state)->dev->mode_config.num_crtc; \
+ (__i) < (state)->dev->mode_config.num_crtc && \
+ ((crtc) = (state)->crtcs[__i], \
+ (crtc_state) = (state)->crtc_states[__i], 1); \
(__i)++) \
if (crtc_state)
-#define for_each_plane_in_state(state, plane, plane_state, __i) \
- for ((__i) = 0; \
- (plane) = (state)->planes[__i], \
- (plane_state) = (state)->plane_states[__i], \
- (__i) < (state)->dev->mode_config.num_total_plane; \
- (__i)++) \
+#define for_each_plane_in_state(state, plane, plane_state, __i) \
+ for ((__i) = 0; \
+ (__i) < (state)->dev->mode_config.num_total_plane && \
+ ((plane) = (state)->planes[__i], \
+ (plane_state) = (state)->plane_states[__i], 1); \
+ (__i)++) \
if (plane_state)
#endif /* DRM_ATOMIC_H_ */