[PATCH v3 6/9] platform/x86/intel/ifs: Metadata validation for start_chunk

[Jithu Joseph]

Add an additional check to validate IFS image metadata field prior to
loading the test image.

If start_chunk is not a multiple of chunks_per_stride error out.

Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Tested-by: Pengfei Xu <pengfei.xu@xxxxxxxxx>
---
 - changed the dev_warn printk format specifiers (Ilpo Järvinen)

 drivers/platform/x86/intel/ifs/load.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 582f1801aaaa..959b1878cae6 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -291,6 +291,13 @@ static int validate_ifs_metadata(struct device *dev)
 		return ret;
 	}
 
+	if (ifs_meta->chunks_per_stride &&
+	    (ifs_meta->starting_chunk % ifs_meta->chunks_per_stride != 0)) {
+		dev_warn(dev, "Starting chunk num %u not a multiple of chunks_per_stride %u\n",
+			 ifs_meta->starting_chunk, ifs_meta->chunks_per_stride);
+		return ret;
+	}
+
 	return 0;
 }
 
-- 
2.25.1