[AMD Official Use Only - General] Reviewed-by: Aurabindo Pillai <aurabindo.pil...@amd.com>
-- Regards, Jay ________________________________ From: Mahfooz, Hamza <hamza.mahf...@amd.com> Sent: Tuesday, September 27, 2022 3:12 PM To: linux-ker...@vger.kernel.org <linux-ker...@vger.kernel.org> Cc: Mahfooz, Hamza <hamza.mahf...@amd.com>; Wentland, Harry <harry.wentl...@amd.com>; Li, Sun peng (Leo) <sunpeng...@amd.com>; Siqueira, Rodrigo <rodrigo.sique...@amd.com>; Deucher, Alexander <alexander.deuc...@amd.com>; Koenig, Christian <christian.koe...@amd.com>; Pan, Xinhui <xinhui....@amd.com>; David Airlie <airl...@linux.ie>; Daniel Vetter <dan...@ffwll.ch>; Lee, Alvin <alvin.l...@amd.com>; Hung, Alex <alex.h...@amd.com>; Kotarac, Pavle <pavle.kota...@amd.com>; Wang, Chao-kai (Stylon) <stylon.w...@amd.com>; Pillai, Aurabindo <aurabindo.pil...@amd.com>; Ma, Leo <hanghong...@amd.com>; Wu, Hersen <hersenxs...@amd.com>; Po-Yu Hsieh Paul <paul.hs...@amd.com>; Jimmy Kizito <jimmy.kiz...@amd.com>; amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>; dri-de...@lists.freedesktop.org <dri-de...@lists.freedesktop.org> Subject: [PATCH] drm/amd/display: fix array-bounds error in dc_stream_remove_writeback() Address the following error: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c: In function ‘dc_stream_remove_writeback’: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:55: error: array subscript [0, 0] is outside array bounds of ‘struct dc_writeback_info[1]’ [-Werror=array-bounds] 527 | stream->writeback_info[j] = stream->writeback_info[i]; | ~~~~~~~~~~~~~~~~~~~~~~^~~ In file included from ./drivers/gpu/drm/amd/amdgpu/../display/dc/dc.h:1269, from ./drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core_types.h:29, from ./drivers/gpu/drm/amd/amdgpu/../display/dc/basics/dc_common.h:29, from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:27: ./drivers/gpu/drm/amd/amdgpu/../display/dc/dc_stream.h:241:34: note: while referencing ‘writeback_info’ 241 | struct dc_writeback_info writeback_info[MAX_DWB_PIPES]; | Currently, we aren't checking to see if j remains within writeback_info[]'s bounds. So, add a check to make sure that we aren't overflowing the buffer. Signed-off-by: Hamza Mahfooz <hamza.mahf...@amd.com> --- drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c index 3ca1592ce7ac..ae13887756bf 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c @@ -520,7 +520,7 @@ bool dc_stream_remove_writeback(struct dc *dc, } /* remove writeback info for disabled writeback pipes from stream */ - for (i = 0, j = 0; i < stream->num_wb_info; i++) { + for (i = 0, j = 0; i < stream->num_wb_info && j < MAX_DWB_PIPES; i++) { if (stream->writeback_info[i].wb_enabled) { if (i != j) /* trim the array */ -- 2.37.2