linux-kernel - [PATCH] bus: fsl-mc: Fix the double free in fsl_mc_device

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Message-Id: <20241114082751.3475110-1-suhui@nfschina.com>
Date: Thu, 14 Nov 2024 16:27:52 +0800
From: Su Hui <suhui@...china.com>
To: stuyoder@...il.com,
	laurentiu.tudor@....com,
	nathan@...nel.org,
	ndesaulniers@...gle.com,
	morbo@...gle.com,
	justinstitt@...gle.com
Cc: Su Hui <suhui@...china.com>,
	gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] bus: fsl-mc:  Fix the double free in fsl_mc_device_add()

Clang static checker(scan-build) warning：
drivers/bus/fsl-mc/fsl-mc-bus.c: line 909, column 2
Attempt to free released memory.

When 'obj_desc->type' == "dprc" and begin to free 'mc_bus' and 'mc_dev',
there is a double free problem because of 'mc_dev = &mc_bus->mc_dev'.
Add a judgment to fix this problem.

Fixes: a042fbed0290 ("staging: fsl-mc: simplify couple of deallocations")
Signed-off-by: Su Hui <suhui@...china.com>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 930d8a3ba722..8d2d5d3cc782 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -905,8 +905,10 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
 
 error_cleanup_dev:
 	kfree(mc_dev->regions);
-	kfree(mc_bus);
-	kfree(mc_dev);
+	if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
+		kfree(mc_bus);
+	else
+		kfree(mc_dev);
 
 	return error;
 }
-- 
2.30.2