Patchwork isdnloop: fix and simplify isdnloop_init()

login
register
mail settings
Submitter Wu Fengguang
Date Aug. 2, 2012, 11:05 a.m.
Message ID <20120802110543.GA21745@localhost>
Download mbox | patch
Permalink /patch/174732/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

Wu Fengguang - Aug. 2, 2012, 11:05 a.m.
Fix a buffer overflow bug by removing the revision transform code.

[   22.016214] isdnloop-ISDN-driver Rev 1.11.6.7 
[   22.097508] isdnloop: (loop0) virtual card added
[   22.174400] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff83244972
[   22.174400] 
[   22.436157] Pid: 1, comm: swapper Not tainted 3.5.0-bisect-00018-gfa8bbb1-dirty #129
[   22.624071] Call Trace:
[   22.720558]  [<ffffffff832448c3>] ? CallcNew+0x56/0x56
[   22.815248]  [<ffffffff8222b623>] panic+0x110/0x329
[   22.914330]  [<ffffffff83244972>] ? isdnloop_init+0xaf/0xb1
[   23.014800]  [<ffffffff832448c3>] ? CallcNew+0x56/0x56
[   23.090763]  [<ffffffff8108e24b>] __stack_chk_fail+0x2b/0x30
[   23.185748]  [<ffffffff83244972>] isdnloop_init+0xaf/0xb1

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/isdn/isdnloop/isdnloop.c |   13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
David Miller - Aug. 2, 2012, 11:21 p.m.
From: Fengguang Wu <fengguang.wu@intel.com>
Date: Thu, 2 Aug 2012 19:05:43 +0800

> Fix a buffer overflow bug by removing the revision transform code.
> 
> [   22.016214] isdnloop-ISDN-driver Rev 1.11.6.7 
> [   22.097508] isdnloop: (loop0) virtual card added
> [   22.174400] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff83244972
> [   22.174400] 
> [   22.436157] Pid: 1, comm: swapper Not tainted 3.5.0-bisect-00018-gfa8bbb1-dirty #129
> [   22.624071] Call Trace:
> [   22.720558]  [<ffffffff832448c3>] ? CallcNew+0x56/0x56
> [   22.815248]  [<ffffffff8222b623>] panic+0x110/0x329
> [   22.914330]  [<ffffffff83244972>] ? isdnloop_init+0xaf/0xb1
> [   23.014800]  [<ffffffff832448c3>] ? CallcNew+0x56/0x56
> [   23.090763]  [<ffffffff8108e24b>] __stack_chk_fail+0x2b/0x30
> [   23.185748]  [<ffffffff83244972>] isdnloop_init+0xaf/0xb1
> 
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>

The reason the "$Revision ..." prefix is there is so that automated
version control tools will change the string automatically when code
is committed in CVS.

In the GIT era this revision style is obsolete.

Therefore you might as well just delete this crap altogether.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch

--- linux.orig/drivers/isdn/isdnloop/isdnloop.c	2012-05-24 19:03:06.748430938 +0800
+++ linux/drivers/isdn/isdnloop/isdnloop.c	2012-08-02 11:57:16.806437909 +0800
@@ -16,7 +16,7 @@ 
 #include <linux/sched.h>
 #include "isdnloop.h"
 
-static char *revision = "$Revision: 1.11.6.7 $";
+static char *revision = "1.11.6.7";
 static char *isdnloop_id = "loop0";
 
 MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
@@ -1494,16 +1494,7 @@  isdnloop_addcard(char *id1)
 static int __init
 isdnloop_init(void)
 {
-	char *p;
-	char rev[10];
-
-	if ((p = strchr(revision, ':'))) {
-		strcpy(rev, p + 1);
-		p = strchr(rev, '$');
-		*p = 0;
-	} else
-		strcpy(rev, " ??? ");
-	printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
+	printk(KERN_NOTICE "isdnloop-ISDN-driver Rev %s\n", revision);
 
 	if (isdnloop_id)
 		return (isdnloop_addcard(isdnloop_id));