linux-kernel - [PATCH] block: sed-opal: avoid possible wrong address reference in read_sed_opal

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Date: Tue, 11 Jun 2024 15:37:00 +0800
From: Su Hui <suhui@...china.com>
To: jonathan.derrick@...ux.dev,
	axboe@...nel.dk,
	nathan@...nel.org,
	ndesaulniers@...gle.com,
	morbo@...gle.com,
	justinstitt@...gle.com
Cc: Su Hui <suhui@...china.com>,
	jarkko@...nel.org,
	gjoyce@...ux.vnet.ibm.com,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] block: sed-opal: avoid possible wrong address reference in read_sed_opal_key()

Clang static checker (scan-build) warning:
block/sed-opal.c:line 317, column 3
Value stored to 'ret' is never read.

Fix this problem by returning the error code when keyring_search() failed.
Otherwise, 'key' will have a wrong value when 'kerf' stores the error code.

Fixes: 3bfeb6125664 ("block: sed-opal: keyring support for SED keys")
Signed-off-by: Su Hui <suhui@...china.com>
---
 block/sed-opal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 14fe0fef811c..598fd3e7fcc8 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -314,7 +314,7 @@ static int read_sed_opal_key(const char *key_name, u_char *buffer, int buflen)
 			      &key_type_user, key_name, true);
 
 	if (IS_ERR(kref))
-		ret = PTR_ERR(kref);
+		return PTR_ERR(kref);
 
 	key = key_ref_to_ptr(kref);
 	down_read(&key->sem);
-- 
2.30.2