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soc: qcom: mdt_loader: Deal with zero e_shentsize

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commit 25daf9af0ac1bf12490b723b5efaf8dcc85980bc upstream.

Firmware that doesn't provide section headers leave both e_shentsize and
e_shnum 0, which obvious isn't compatible with the newly introduced
stricter checks.

Make the section-related checks conditional on either of these values
being non-zero.

Fixes: 9f9967fed9 ("soc: qcom: mdt_loader: Ensure we don't read past the ELF header")
Reported-by: Val Packett <val@packett.cool>
Closes: https://lore.kernel.org/all/ece307c3-7d65-440f-babd-88cf9705b908@packett.cool/
Reported-by: Neil Armstrong <neil.armstrong@linaro.org>
Closes: https://lore.kernel.org/all/aec9cd03-6fc2-4dc8-b937-8b7cf7bf4128@linaro.org/
Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
Fixes: 9f35ab0e53 ("soc: qcom: mdt_loader: Fix error return values in mdt_header_valid()")
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250730-mdt-loader-shentsize-zero-v1-1-04f43186229c@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjorn Andersson 2025-07-30 15:51:51 -05:00 committed by Greg Kroah-Hartman
parent c2daa6eb47
commit 2fae927c25
1 changed files with 7 additions and 5 deletions
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12
drivers/soc/qcom/mdt_loader.c
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@ -39,12 +39,14 @@ static bool mdt_header_valid(const struct firmware *fw)
if (phend > fw->size)
return false;
if (ehdr->e_shentsize != sizeof(struct elf32_shdr))
return false;
if (ehdr->e_shentsize || ehdr->e_shnum) {
if (ehdr->e_shentsize != sizeof(struct elf32_shdr))
return false;
shend = size_add(size_mul(sizeof(struct elf32_shdr), ehdr->e_shnum), ehdr->e_shoff);
if (shend > fw->size)
return false;
shend = size_add(size_mul(sizeof(struct elf32_shdr), ehdr->e_shnum), ehdr->e_shoff);
if (shend > fw->size)
return false;
}
return true;
}