linux-kernel - [PATCH] EDAC/versal: Fix possible null pointer dereference in emif_get

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Message-Id: <20240709135830.1172936-1-make24@iscas.ac.cn>
Date: Tue,  9 Jul 2024 21:58:30 +0800
From: Ma Ke <make24@...as.ac.cn>
To: shubhrajyoti.datta@....com,
	sai.krishna.potthuri@....com,
	bp@...en8.de,
	tony.luck@...el.com,
	james.morse@....com,
	mchehab@...nel.org,
	rric@...nel.org
Cc: linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make24@...as.ac.cn>
Subject: [PATCH] EDAC/versal: Fix possible null pointer dereference in emif_get_id()

In emif_get_id(), of_get_address() may return NULL which is later
dereferenced. Fix this bug by adding NULL check.

Fixes: 6f15b178cd63 ("EDAC/versal: Add a Xilinx Versal memory controller driver")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
 drivers/edac/versal_edac.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/edac/versal_edac.c b/drivers/edac/versal_edac.c
index a556d23e8261..6ab87277d439 100644
--- a/drivers/edac/versal_edac.c
+++ b/drivers/edac/versal_edac.c
@@ -1053,6 +1053,9 @@ static u32 emif_get_id(struct device_node *node)
 	const __be32 *addrp;
 
 	addrp = of_get_address(node, 0, NULL, NULL);
+	if (!addrp)
+		return -EINVAL;
+
 	my_addr = (u32)of_translate_address(node, addrp);
 
 	for_each_matching_node(np, xlnx_edac_match) {
@@ -1060,6 +1063,9 @@ static u32 emif_get_id(struct device_node *node)
 			continue;
 
 		addrp = of_get_address(np, 0, NULL, NULL);
+		if (!addrp)
+			return _EINVAL;
+
 		addr = (u32)of_translate_address(np, addrp);
 
 		edac_printk(KERN_INFO, EDAC_MC,
-- 
2.25.1