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soc: qcom: mdt_loader: Detect truncated read of segments

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[ Upstream commit 0648c55e3a21ccd816e99b6600d6199fbf39d23a ]

Given that no validation of how much data the firmware loader read in
for a given segment truncated segment files would best case result in a
hash verification failure, without any indication of what went wrong.

Improve this by validating that the firmware loader did return the
amount of data requested.

Fixes: 445c2410a4 ("soc: qcom: mdt_loader: Use request_firmware_into_buf()")
Reviewed-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20210107232526.716989-1-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bjorn Andersson 2021-01-07 15:25:26 -08:00 committed by Greg Kroah-Hartman
parent ab86e5145f
commit d97cb43657
1 changed files with 9 additions and 0 deletions
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9
drivers/soc/qcom/mdt_loader.c
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@ -261,6 +261,15 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
break;
}
if (seg_fw->size != phdr->p_filesz) {
dev_err(dev,
"failed to load segment %d from truncated file %s\n",
i, fw_name);
release_firmware(seg_fw);
ret = -EINVAL;
break;
}
release_firmware(seg_fw);
}