linux-kernel - [PATCH] misc: mei: client.c: fix some error code problem in mei_cl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20231120085343.157381-1-suhui@nfschina.com>
Date:   Mon, 20 Nov 2023 16:53:45 +0800
From:   Su Hui <suhui@...china.com>
To:     tomas.winkler@...el.com, arnd@...db.de, gregkh@...uxfoundation.org,
        nathan@...nel.org, ndesaulniers@...gle.com, trix@...hat.com
Cc:     Su Hui <suhui@...china.com>, alexander.usyskin@...el.com,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] misc: mei: client.c: fix some error code problem in mei_cl_write

Clang static analyzer complains that value stored to 'rets' is never
read. Remove some useless code, and let 'buf_len = -EOVERFLOW' to make
sure we can return '-EOVERFLOW'.

mei_msg_hdr_init() return negative error code, rets should be
'PTR_ERR(mei_hdr)' rather than '-PTR_ERR(mei_hdr)'.

Fixes: 0cd7c01a60f8 ("mei: add support for mei extended header.")
Fixes: 8c8d964ce90f ("mei: move hbuf_depth from the mei device to the hw modules")
Signed-off-by: Su Hui <suhui@...china.com>
---
 drivers/misc/mei/client.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 9c8fc87938a7..00dac0a47da0 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -2011,7 +2011,7 @@ ssize_t mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, unsigned long time
 
 	mei_hdr = mei_msg_hdr_init(cb);
 	if (IS_ERR(mei_hdr)) {
-		rets = -PTR_ERR(mei_hdr);
+		rets = PTR_ERR(mei_hdr);
 		mei_hdr = NULL;
 		goto err;
 	}
@@ -2020,19 +2020,17 @@ ssize_t mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, unsigned long time
 
 	if (rets == 0) {
 		cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
-		rets = buf_len;
 		goto out;
 	}
 
 	if (!mei_hbuf_acquire(dev)) {
 		cl_dbg(dev, cl, "Cannot acquire the host buffer: not sending.\n");
-		rets = buf_len;
 		goto out;
 	}
 
 	hbuf_slots = mei_hbuf_empty_slots(dev);
 	if (hbuf_slots < 0) {
-		rets = -EOVERFLOW;
+		buf_len = -EOVERFLOW;
 		goto out;
 	}
 
-- 
2.30.2