isdnloop: fix and simplify isdnloop_init()

Submitted by Wu Fengguang on Aug. 2, 2012, 11:05 a.m.

Details

Message ID 20120802110543.GA21745@localhost
State Changes Requested
Delegated to: David Miller
Headers show

Commit Message

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(-)

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Comments

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In the GIT era this revision style is obsolete.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.
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Patch hide | download patch | download mbox

--- 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));