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From:   Jithu Joseph <jithu.joseph@intel.com>
To:     hdegoede@redhat.com, markgross@kernel.org
Cc:     tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
        rostedt@goodmis.org, jithu.joseph@intel.com, ashok.raj@intel.com,
        tony.luck@intel.com, linux-kernel@vger.kernel.org,
        platform-driver-x86@vger.kernel.org, patches@lists.linux.dev,
        ravi.v.shankar@intel.com, pengfei.xu@intel.com
Subject: [PATCH 07/10] platform/x86/intel/ifs: Metadata validation for start_chunk
Date:   Wed, 13 Sep 2023 11:33:45 -0700
Message-Id: <20230913183348.1349409-8-jithu.joseph@intel.com>
In-Reply-To: <20230913183348.1349409-1-jithu.joseph@intel.com>
References: <20230913183348.1349409-1-jithu.joseph@intel.com>
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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@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
---
 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 778a3b89a24d..88630366a23c 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -292,6 +292,13 @@ 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)) {
+		dev_warn(dev, "Starting chunk num %d not a multiple of chunks_per_stride %d\n",
+			 ifs_meta->starting_chunk, ifs_meta->chunks_per_stride);
+		return ret;
+	}
+
 	return 0;
 }
 
-- 
2.25.1