remoteproc: qcom: mdt_loader: Use signed type for offset
In the transition from using rproc_da_to_va(), the type of the load
offset became unsigned. This causes the subsequent check to let negative
values less than p_memsz + mem_size through and we write outside of the
buffer.
Change the type back to a signed value to catch this.
Fixes: 7f0dd07a9b29 ("remoteproc: qcom: mdt_loader: Refactor MDT loader")
Fixes: e7fd25226295 ("remoteproc: qcom: q6v5: Decouple driver from MDT loader")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 98b2373..bd63df0 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -98,7 +98,7 @@ int qcom_mdt_load(struct device *dev, const struct firmware *fw,
phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
phys_addr_t max_addr = 0;
size_t fw_name_len;
- size_t offset;
+ ssize_t offset;
char *fw_name;
bool relocate = false;
void *ptr;