From: Courtney Goeltzenleuchter Date: Tue, 8 Apr 2014 15:10:09 +0000 (-0600) Subject: mesa: add bounds checking to eliminate buffer overrun X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cb4ad1368551b64756c7b6e2007588e34739b188;p=mesa.git mesa: add bounds checking to eliminate buffer overrun Decompressing ETC2 textures was causing intermitent segfault by copying resulting 4x4 texel block to the destination texture regardless of the size of the destination texture. Issue found via application crash in GLBenchmark 3.0's Manhattan test. v2: add more detail comment. Compute limit outside inner loops. v3: add bugzilla reference v4: Correct cc syntax in commit log v5: really grab the right patch Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74988 Cc: "9.2 10.0 10.1" Reviewed-by: Kenneth Graunke Reviewed-by: Ian Romanick [v1, suggested v2-3] --- diff --git a/src/mesa/main/texcompress_etc.c b/src/mesa/main/texcompress_etc.c index cbda689409e..75019820577 100644 --- a/src/mesa/main/texcompress_etc.c +++ b/src/mesa/main/texcompress_etc.c @@ -678,14 +678,25 @@ etc2_unpack_rgb8(uint8_t *dst_row, for (y = 0; y < height; y += bh) { const uint8_t *src = src_row; + /* + * Destination texture may not be a multiple of four texels in + * height. Compute a safe height to avoid writing outside the texture. + */ + const unsigned h = MIN2(bh, height - y); for (x = 0; x < width; x+= bw) { etc2_rgb8_parse_block(&block, src, false /* punchthrough_alpha */); - for (j = 0; j < bh; j++) { + /* + * Destination texture may not be a multiple of four texels in + * width. Compute a safe width to avoid writing outside the texture. + */ + const unsigned w = MIN2(bw, width - x); + + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_rgb8_fetch_texel(&block, i, j, dst, false /* punchthrough_alpha */); dst[3] = 255; @@ -715,14 +726,17 @@ etc2_unpack_srgb8(uint8_t *dst_row, for (y = 0; y < height; y += bh) { const uint8_t *src = src_row; + const unsigned h = MIN2(bh, height - y); for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_rgb8_parse_block(&block, src, false /* punchthrough_alpha */); - for (j = 0; j < bh; j++) { + + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_rgb8_fetch_texel(&block, i, j, dst, false /* punchthrough_alpha */); /* Convert to MESA_FORMAT_B8G8R8A8_SRGB */ @@ -759,13 +773,15 @@ etc2_unpack_rgba8(uint8_t *dst_row, for (y = 0; y < height; y += bh) { const uint8_t *src = src_row; + const unsigned h = MIN2(bh, height - y); for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_rgba8_parse_block(&block, src); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_rgba8_fetch_texel(&block, i, j, dst); dst += comps; } @@ -795,14 +811,16 @@ etc2_unpack_srgb8_alpha8(uint8_t *dst_row, uint8_t tmp; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_rgba8_parse_block(&block, src); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_rgba8_fetch_texel(&block, i, j, dst); /* Convert to MESA_FORMAT_B8G8R8A8_SRGB */ @@ -837,14 +855,16 @@ etc2_unpack_r11(uint8_t *dst_row, unsigned x, y, i, j; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_r11_parse_block(&block, src); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_r11_fetch_texel(&block, i, j, dst); dst += comps * comp_size; } @@ -872,16 +892,18 @@ etc2_unpack_rg11(uint8_t *dst_row, unsigned x, y, i, j; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); /* red component */ etc2_r11_parse_block(&block, src); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_r11_fetch_texel(&block, i, j, dst); dst += comps * comp_size; } @@ -889,10 +911,10 @@ etc2_unpack_rg11(uint8_t *dst_row, /* green component */ etc2_r11_parse_block(&block, src + 8); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_r11_fetch_texel(&block, i, j, dst + comp_size); dst += comps * comp_size; } @@ -920,15 +942,17 @@ etc2_unpack_signed_r11(uint8_t *dst_row, unsigned x, y, i, j; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_r11_parse_block(&block, src); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_signed_r11_fetch_texel(&block, i, j, dst); dst += comps * comp_size; } @@ -956,16 +980,18 @@ etc2_unpack_signed_rg11(uint8_t *dst_row, unsigned x, y, i, j; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); /* red component */ etc2_r11_parse_block(&block, src); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_signed_r11_fetch_texel(&block, i, j, dst); dst += comps * comp_size; } @@ -973,10 +999,10 @@ etc2_unpack_signed_rg11(uint8_t *dst_row, /* green component */ etc2_r11_parse_block(&block, src + 8); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps * comp_size; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_signed_r11_fetch_texel(&block, i, j, dst + comp_size); dst += comps * comp_size; } @@ -1001,14 +1027,16 @@ etc2_unpack_rgb8_punchthrough_alpha1(uint8_t *dst_row, unsigned x, y, i, j; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_rgb8_parse_block(&block, src, true /* punchthrough_alpha */); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_rgb8_fetch_texel(&block, i, j, dst, true /* punchthrough_alpha */); dst += comps; @@ -1036,14 +1064,16 @@ etc2_unpack_srgb8_punchthrough_alpha1(uint8_t *dst_row, uint8_t tmp; for (y = 0; y < height; y += bh) { + const unsigned h = MIN2(bh, height - y); const uint8_t *src = src_row; for (x = 0; x < width; x+= bw) { + const unsigned w = MIN2(bw, width - x); etc2_rgb8_parse_block(&block, src, true /* punchthrough_alpha */); - for (j = 0; j < bh; j++) { + for (j = 0; j < h; j++) { uint8_t *dst = dst_row + (y + j) * dst_stride + x * comps; - for (i = 0; i < bw; i++) { + for (i = 0; i < w; i++) { etc2_rgb8_fetch_texel(&block, i, j, dst, true /* punchthrough_alpha */); /* Convert to MESA_FORMAT_B8G8R8A8_SRGB */