linux-kernel - [PATCH] cxgb4: do conversion after string check

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Message-Id: <20230330154703.36958-1-den-plotnikov@yandex-team.ru>
Date:   Thu, 30 Mar 2023 18:47:03 +0300
From:   Denis Plotnikov <den-plotnikov@...dex-team.ru>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, rajur@...lsio.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, den-plotnikov@...dex-team.ru
Subject: [PATCH] cxgb4: do conversion after string check

Static code analyzer complains to uncheck return value.
Indeed, the return value of kstrtouint "must be checked"
as the comment says.
Moreover, it looks like the string conversion  should be
after "end of string" or "new line" check.
This patch fixes these issues.

Signed-off-by: Denis Plotnikov <den-plotnikov@...dex-team.ru>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 14e0d989c3ba5..a8d3616630cc6 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -1576,9 +1576,11 @@ inval:				count = -EINVAL;
 		}
 		if (*word == '@') {
 			end = (char *)word + 1;
-			ret = kstrtouint(end, 10, &j);
 			if (*end && *end != '\n')
 				goto inval;
+			ret = kstrtouint(end, 10, &j);
+			if (ret)
+				goto inval;
 			if (j & 7)          /* doesn't start at multiple of 8 */
 				goto inval;
 			j /= 8;
-- 
2.25.1