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From: Nathan Chancellor <natechancellor@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: John Whitmore <johnfwhitmore@gmail.com>,
	devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
	clang-built-linux@googlegroups.com,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH] staging: rtl8192u: Remove an unnecessary NULL check
Date: Tue, 21 May 2019 10:42:21 -0700	[thread overview]
Message-ID: <20190521174221.124459-1-natechancellor@gmail.com> (raw)

Clang warns:

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c:2663:47: warning:
address of array 'param->u.wpa_ie.data' will always evaluate to 'true'
[-Wpointer-bool-conversion]
            (param->u.wpa_ie.len && !param->u.wpa_ie.data))
                                    ~~~~~~~~~~~~~~~~~^~~~

This was exposed by commit deabe03523a7 ("Staging: rtl8192u: ieee80211:
Use !x in place of NULL comparisons") because we disable the warning
that would have pointed out the comparison against NULL is also false:

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c:2663:46: warning:
comparison of array 'param->u.wpa_ie.data' equal to a null pointer is
always false [-Wtautological-pointer-compare]
            (param->u.wpa_ie.len && param->u.wpa_ie.data == NULL))
                                    ~~~~~~~~~~~~~~~~^~~~    ~~~~

Remove it so clang no longer warns.

Link: https://github.com/ClangBuiltLinux/linux/issues/487
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
index f38f9d8b78bb..e0da0900a4f7 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
@@ -2659,8 +2659,7 @@ static int ieee80211_wpa_set_wpa_ie(struct ieee80211_device *ieee,
 {
 	u8 *buf;
 
-	if (param->u.wpa_ie.len > MAX_WPA_IE_LEN ||
-	    (param->u.wpa_ie.len && !param->u.wpa_ie.data))
+	if (param->u.wpa_ie.len > MAX_WPA_IE_LEN)
 		return -EINVAL;
 
 	if (param->u.wpa_ie.len) {
-- 
2.22.0.rc1


             reply	other threads:[~2019-05-21 17:42 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21 17:42 Nathan Chancellor [this message]
2019-05-21 22:53 ` Nick Desaulniers
2019-05-21 22:57   ` Nick Desaulniers
2019-05-22  9:24     ` Dan Carpenter
2019-05-22  7:04 ` Dan Carpenter
2019-05-22 20:39   ` Nathan Chancellor

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