Perform additional validation prior to loading IFS image.
Error out if the size of the file being loaded doesn't match the size
specified in the header.
Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
---
drivers/platform/x86/intel/ifs/load.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 6b827247945b..b09106034fac 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -375,6 +375,7 @@ int ifs_load_firmware(struct device *dev)
{
const struct ifs_test_caps *test = ifs_get_test_caps(dev);
struct ifs_data *ifsd = ifs_get_data(dev);
+ unsigned int expected_size;
const struct firmware *fw;
char scan_path[64];
int ret = -EINVAL;
@@ -389,6 +390,13 @@ int ifs_load_firmware(struct device *dev)
goto done;
}
+ expected_size = ((struct microcode_header_intel *)fw->data)->totalsize;
+ if (fw->size != expected_size) {
+ dev_err(dev, "File size mismatch (expected %d, actual %ld). Corrupted IFS image.\n",
+ expected_size, fw->size);
+ return -EBADFD;
+ }
+
ret = image_sanity_check(dev, (struct microcode_header_intel *)fw->data);
if (ret)
goto release;
--
2.25.1
