[PATCH v1] soc: qcom: mdt_loader: Add Upperbounds check for program header access

[Auditya Bhattaram <quic_audityab@quicinc.com>]

hash_index is evaluated by looping phdrs till QCOM_MDT_TYPE_HASH
is found. Add an upperbound check to phdrs to access within elf size.

Signed-off-by: Auditya Bhattaram <quic_audityab@quicinc.com>
---
Added error prints for Invalid access.
Link for previous discussion https://lore.kernel.org/linux-arm-msm/5d7a3b97-d840-4863-91a0-32c1d8e7532f@linaro.org/T/#t
---
 drivers/soc/qcom/mdt_loader.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 6f177e46fa0f..61e2377cc5c3 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -145,6 +145,11 @@ void *qcom_mdt_read_metadata(const struct firmware *fw, size_t *data_len,
 	if (phdrs[0].p_type == PT_LOAD)
 		return ERR_PTR(-EINVAL);

+	if (((size_t)(phdrs + ehdr->e_phnum)) > ((size_t)ehdr + fw->size)) {
+		dev_err(dev, "Invalid phdrs access: %s\n", fw_name);
+		return ERR_PTR(-EINVAL);
+	}
+
 	for (i = 1; i < ehdr->e_phnum; i++) {
 		if ((phdrs[i].p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) {
 			hash_segment = i;
--
2.17.1