3.16.55-rc1 review patch. If anyone has any objections, please let me know.
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From: Ben Hutchings ben.hutchings@codethink.co.uk
commit 50dd2ea8ef67a1617e0c0658bcbec4b9fb03b936 upstream.
The checks for whether another region/block header could be present are subtracting the size from the current offset. Obviously we should instead subtract the offset from the size.
The checks for whether the region/block data fit in the file are adding the data size to the current offset and header size, without checking for integer overflow. Rearrange these so that overflow is impossible.
Signed-off-by: Ben Hutchings ben.hutchings@codethink.co.uk Acked-by: Charles Keepax ckeepax@opensource.cirrus.com Tested-by: Charles Keepax ckeepax@opensource.cirrus.com Signed-off-by: Mark Brown broonie@kernel.org [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- sound/soc/codecs/wm_adsp.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/sound/soc/codecs/wm_adsp.c +++ b/sound/soc/codecs/wm_adsp.c @@ -622,7 +622,7 @@ static int wm_adsp_load(struct wm_adsp * le64_to_cpu(footer->timestamp));
while (pos < firmware->size && - pos - firmware->size > sizeof(*region)) { + sizeof(*region) < firmware->size - pos) { region = (void *)&(firmware->data[pos]); region_name = "Unknown"; reg = 0; @@ -677,8 +677,8 @@ static int wm_adsp_load(struct wm_adsp * regions, le32_to_cpu(region->len), offset, region_name);
- if ((pos + le32_to_cpu(region->len) + sizeof(*region)) > - firmware->size) { + if (le32_to_cpu(region->len) > + firmware->size - pos - sizeof(*region)) { adsp_err(dsp, "%s.%d: %s region len %d bytes exceeds file length %zu\n", file, regions, region_name, @@ -1248,7 +1248,7 @@ static int wm_adsp_load_coeff(struct wm_
blocks = 0; while (pos < firmware->size && - pos - firmware->size > sizeof(*blk)) { + sizeof(*blk) < firmware->size - pos) { blk = (void*)(&firmware->data[pos]);
type = le16_to_cpu(blk->type); @@ -1328,8 +1328,8 @@ static int wm_adsp_load_coeff(struct wm_ }
if (reg) { - if ((pos + le32_to_cpu(blk->len) + sizeof(*blk)) > - firmware->size) { + if (le32_to_cpu(blk->len) > + firmware->size - pos - sizeof(*blk)) { adsp_err(dsp, "%s.%d: %s region len %d bytes exceeds file length %zu\n", file, blocks, region_name,