[PATCH v2 1/4] soc: qcom: mdt_loader: Fix check mdt_header_valid()

[Mukesh Ojha]

Firmware binaries may lack section headers, in which case
the e_shentsize field in the ELF header can be zero.

Update mdt_header_valid() to correctly handle this scenario
by adjusting the validation logic accordingly.

Fixes: 9f9967fed9d0 ("soc: qcom: mdt_loader: Ensure we don't read past the ELF header")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha at oss.qualcomm.com>
---
Changes in v2:
- Make this patch as first patch of the series.
- Added R-b tag

 drivers/soc/qcom/mdt_loader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 0ca268bdf1f8..2a14ba9b0fb6 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -39,7 +39,7 @@ static bool mdt_header_valid(const struct firmware *fw)
 	if (phend > fw->size)
 		return false;
 
-	if (ehdr->e_shentsize != sizeof(struct elf32_shdr))
+	if (ehdr->e_shentsize && ehdr->e_shentsize != sizeof(struct elf32_shdr))
 		return false;
 
 	shend = size_add(size_mul(sizeof(struct elf32_shdr), ehdr->e_shnum), ehdr->e_shoff);
-- 
2.50.1