linux-kernel - [PATCH] Staging: irda: Use !x instead of NULL comparison

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: <1505543667-4670-1-git-send-email-srishtishar@gmail.com>
Date:   Sat, 16 Sep 2017 12:04:27 +0530
From:   Srishti Sharma <srishtishar@...il.com>
To:     samuel@...tiz.org
Cc:     gregkh@...uxfoundation.org, netdev@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com,
        Srishti Sharma <srishtishar@...il.com>
Subject: [PATCH] Staging: irda: Use !x instead of NULL comparison

Test for NULL as !x where functions that return NULL on failure
are used. Done using the following semantic patch by coccinelle.

@ is_null @
expression E;
statement S;
@@

E = (\(kmalloc\|devm_kzalloc\|kmalloc_array\|devm_ioremap\|
usb_alloc_urb\|alloc_netdev\|dev_alloc_skb\)(...));

(
if(!E)
   S
|
-if(E==NULL)
+if(!E)
    S
)

Signed-off-by: Srishti Sharma <srishtishar@...il.com>
---
 drivers/staging/irda/net/discovery.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/irda/net/discovery.c b/drivers/staging/irda/net/discovery.c
index 364d70a..1e54954 100644
--- a/drivers/staging/irda/net/discovery.c
+++ b/drivers/staging/irda/net/discovery.c
@@ -179,7 +179,7 @@ void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force)
 				/* Create the client specific buffer */
 				n = HASHBIN_GET_SIZE(log);
 				buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
-				if (buffer == NULL) {
+				if (!buffer) {
 					spin_unlock_irqrestore(&log->hb_spinlock, flags);
 					return;
 				}
@@ -291,7 +291,7 @@ struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn,
 				/* Create the client specific buffer */
 				n = HASHBIN_GET_SIZE(log);
 				buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
-				if (buffer == NULL) {
+				if (!buffer) {
 					spin_unlock_irqrestore(&log->hb_spinlock, flags);
 					return NULL;
 				}
-- 
2.7.4