From: Arnd Bergmann <arnd@arndb.de>
To: Karsten Keil <isdn@linux-pingi.de>,
"David S. Miller" <davem@davemloft.net>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Arnd Bergmann <arnd@arndb.de>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] isdn: isdnloop: fix pointer dereference bug
Date: Thu, 7 Mar 2019 10:32:07 +0100 [thread overview]
Message-ID: <20190307093241.3380715-1-arnd@arndb.de> (raw)
clang has spotted an ancient code bug and warns about it with:
drivers/isdn/isdnloop/isdnloop.c:573:12: error: address of array 'card->rcard' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
This is an array of pointers, so we should check if a specific
pointer exists in the array before using it, not whether the
array itself exists.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/isdn/isdnloop/isdnloop.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c
index f4253d468ae1..755c6bbc9553 100644
--- a/drivers/isdn/isdnloop/isdnloop.c
+++ b/drivers/isdn/isdnloop/isdnloop.c
@@ -570,7 +570,7 @@ isdnloop_atimeout(isdnloop_card *card, int ch)
char buf[60];
spin_lock_irqsave(&card->isdnloop_lock, flags);
- if (card->rcard) {
+ if (card->rcard[ch]) {
isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
card->rcard[ch]->rcard[card->rch[ch]] = NULL;
card->rcard[ch] = NULL;
--
2.20.0
next reply other threads:[~2019-03-07 9:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 9:32 Arnd Bergmann [this message]
2019-03-07 15:17 ` [PATCH] isdn: isdnloop: fix pointer dereference bug Nathan Chancellor
2019-03-07 17:29 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190307093241.3380715-1-arnd@arndb.de \
--to=arnd@arndb.de \
--cc=davem@davemloft.net \
--cc=isdn@linux-pingi.de \
--cc=linux-kernel@vger.kernel.org \
--cc=ndesaulniers@google.com \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.