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From:   Bjorn Andersson <quic_bjorande@quicinc.com>
To:     Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Melody Olvera <quic_molvera@quicinc.com>,
        "Gokul krishna Krishnakumar" <quic_gokukris@quicinc.com>
CC:     <linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] soc: qcom: mdt_loader: Fix split image detection
Date:   Mon, 12 Jun 2023 14:58:04 -0700
Message-ID: <20230612215804.1883458-1-quic_bjorande@quicinc.com>
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The enhanced detection introduced in commit '210d12c8197a ("soc: qcom:
mdt_loader: Enhance split binary detection")' requires that all segments
lies within the file on disk.

But the Qualcomm firmware files consistently has a BSS-like segment at
the end, with a p_offset aligned to the next 4k boundary. As the p_size
is 0 and there's nothing to load, the image is not padded to cover this
(empty) segment.

Ignore zero-sized segments when determining if the image is split, to
avoid this problem.

Fixes: 210d12c8197a ("soc: qcom: mdt_loader: Enhance split binary detection")
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
---
 drivers/soc/qcom/mdt_loader.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 9418993a3a92..6f177e46fa0f 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -275,6 +275,14 @@ static bool qcom_mdt_bins_are_split(const struct firmware *fw, const char *fw_na
 	phdrs = (struct elf32_phdr *)(ehdr + 1);
 
 	for (i = 0; i < ehdr->e_phnum; i++) {
+		/*
+		 * The size of the MDT file is not padded to include any
+		 * zero-sized segments at the end. Ignore these, as they should
+		 * not affect the decision about image being split or not.
+		 */
+		if (!phdrs[i].p_filesz)
+			continue;
+
 		seg_start = phdrs[i].p_offset;
 		seg_end = phdrs[i].p_offset + phdrs[i].p_filesz;
 		if (seg_start > fw->size || seg_end > fw->size)
-- 
2.25.1