linux-kernel - [PATCH 09/12] soc: qcom: smem: verify partition offset_free

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Message-Id: <20180502011019.22812-10-elder@linaro.org>
Date:   Tue,  1 May 2018 20:10:16 -0500
From:   Alex Elder <elder@...aro.org>
To:     andy.gross@...aro.org
Cc:     clew@...eaurora.org, aneela@...eaurora.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/12] soc: qcom: smem: verify partition offset_free_uncached

Add verification in qcom_smem_partition_header() that the
offset_free_uncached field in a partition's header structure does
not exceed the partition's size.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/soc/qcom/smem.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index f1e6e4609ccb..7ef415c4d62e 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -755,6 +755,12 @@ qcom_smem_partition_header(struct qcom_smem *smem,
 		return NULL;
 	}
 
+	if (le32_to_cpu(header->offset_free_uncached) > size) {
+		dev_err(smem->dev, "bad partition free uncached (%u > %u)\n",
+			le32_to_cpu(header->offset_free_uncached), size);
+		return NULL;
+	}
+
 	return header;
 }
 
@@ -763,7 +769,7 @@ static int qcom_smem_set_global_partition(struct qcom_smem *smem)
 	struct smem_partition_header *header;
 	struct smem_ptable_entry *entry;
 	struct smem_ptable *ptable;
-	u32 host0, host1, size;
+	u32 host0, host1;
 	bool found = false;
 	int i;
 
@@ -803,13 +809,6 @@ static int qcom_smem_set_global_partition(struct qcom_smem *smem)
 		return -EINVAL;
 	}
 
-	size = le32_to_cpu(header->offset_free_uncached);
-	if (size > le32_to_cpu(header->size)) {
-		dev_err(smem->dev,
-			"Global partition has invalid free pointer\n");
-		return -EINVAL;
-	}
-
 	smem->global_partition = header;
 	smem->global_cacheline = le32_to_cpu(entry->cacheline);
 
@@ -871,12 +870,6 @@ static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
 			return -EINVAL;
 		}
 
-		if (le32_to_cpu(header->offset_free_uncached) > le32_to_cpu(header->size)) {
-			dev_err(smem->dev,
-				"Partition %d has invalid free pointer\n", i);
-			return -EINVAL;
-		}
-
 		smem->partitions[remote_host] = header;
 		smem->cacheline[remote_host] = le32_to_cpu(entry->cacheline);
 	}
-- 
2.14.1