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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, kernel test robot <lkp@intel.com>,
        stable <stable@kernel.org>,
        Shuah Khan <skhan@linuxfoundation.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 05/26] misc: rtsx_usb: set return value in rsp_buf alloc err path
Date:   Wed, 27 Jul 2022 18:10:34 +0200
Message-Id: <20220727160959.355318920@linuxfoundation.org>
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From: Shuah Khan <skhan@linuxfoundation.org>

[ Upstream commit 2cd37c2e72449a7add6da1183d20a6247d6db111 ]

Set return value in rsp_buf alloc error path before going to
error handling.

drivers/misc/cardreader/rtsx_usb.c:639:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (!ucr->rsp_buf)
               ^~~~~~~~~~~~~
   drivers/misc/cardreader/rtsx_usb.c:678:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/misc/cardreader/rtsx_usb.c:639:2: note: remove the 'if' if its condition is always false
           if (!ucr->rsp_buf)
           ^~~~~~~~~~~~~~~~~~
   drivers/misc/cardreader/rtsx_usb.c:622:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0

Fixes: 3776c7855985 ("misc: rtsx_usb: use separate command and response buffers")
Reported-by: kernel test robot <lkp@intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20220701165352.15687-1-skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mfd/rtsx_usb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
index 134c6fbd9c50..fd859a7872a6 100644
--- a/drivers/mfd/rtsx_usb.c
+++ b/drivers/mfd/rtsx_usb.c
@@ -647,8 +647,10 @@ static int rtsx_usb_probe(struct usb_interface *intf,
 		return -ENOMEM;
 
 	ucr->rsp_buf = kmalloc(IOBUF_SIZE, GFP_KERNEL);
-	if (!ucr->rsp_buf)
+	if (!ucr->rsp_buf) {
+		ret = -ENOMEM;
 		goto out_free_cmd_buf;
+	}
 
 	usb_set_intfdata(intf, ucr);
 
-- 
2.35.1