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ASoC: sigmadsp: Add __counted_by for struct sigmadsp_data and use struct_size()

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Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

While there, use struct_size() and size_sub() helpers, instead of the
open-coded version, to calculate the size for the allocation of the
whole flexible structure, including of course, the flexible-array
member.

This code was found with the help of Coccinelle, and audited and
fixed manually.

Signed-off-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/ZSRvh1j2MVVhuOUv@work
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2023-10-09 15:24:23 -06:00 committed by Mark Brown
parent fbfe616ad4
commit 4f88c72b24
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GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 3 deletions
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7
sound/soc/codecs/sigmadsp.c
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@ -43,7 +43,7 @@ struct sigmadsp_data {
uint32_t samplerates;
unsigned int addr;
unsigned int length;
uint8_t data[];
uint8_t data[] __counted_by(length);
};
struct sigma_fw_chunk {
@ -270,7 +270,7 @@ static int sigma_fw_load_data(struct sigmadsp *sigmadsp,
length -= sizeof(*data_chunk);
data = kzalloc(sizeof(*data) + length, GFP_KERNEL);
data = kzalloc(struct_size(data, data, length), GFP_KERNEL);
if (!data)
return -ENOMEM;
@ -413,7 +413,8 @@ static int process_sigma_action(struct sigmadsp *sigmadsp,
if (len < 3)
return -EINVAL;
data = kzalloc(sizeof(*data) + len - 2, GFP_KERNEL);
data = kzalloc(struct_size(data, data, size_sub(len, 2)),
GFP_KERNEL);
if (!data)
return -ENOMEM;