lkml.org 
[lkml]   [2010]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[066/114] isdn: fix information leak
2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Dan Carpenter <error27@gmail.com>

[ Upstream commit 4b030d4288a569d6bdeca884d7f102d951f097f2 ]

The main motivation of this patch changing strcpy() to strlcpy().
We strcpy() to copy a 48 byte buffers into a 49 byte buffers. So at
best the last byte has leaked information, or maybe there is an
overflow? Anyway, this patch closes the information leaks by zeroing
the memory and the calls to strlcpy() prevent overflows.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/isdn/sc/ioctl.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/isdn/sc/ioctl.c
+++ b/drivers/isdn/sc/ioctl.c
@@ -174,7 +174,7 @@ int sc_ioctl(int card, scs_ioctl *data)
pr_debug("%s: SCIOGETSPID: ioctl received\n",
sc_adapter[card]->devicename);

- spid = kmalloc(SCIOC_SPIDSIZE, GFP_KERNEL);
+ spid = kzalloc(SCIOC_SPIDSIZE, GFP_KERNEL);
if (!spid) {
kfree(rcvmsg);
return -ENOMEM;
@@ -194,7 +194,7 @@ int sc_ioctl(int card, scs_ioctl *data)
kfree(rcvmsg);
return status;
}
- strcpy(spid, rcvmsg->msg_data.byte_array);
+ strlcpy(spid, rcvmsg->msg_data.byte_array, SCIOC_SPIDSIZE);

/*
* Package the switch type and send to user space
@@ -272,12 +272,12 @@ int sc_ioctl(int card, scs_ioctl *data)
return status;
}

- dn = kmalloc(SCIOC_DNSIZE, GFP_KERNEL);
+ dn = kzalloc(SCIOC_DNSIZE, GFP_KERNEL);
if (!dn) {
kfree(rcvmsg);
return -ENOMEM;
}
- strcpy(dn, rcvmsg->msg_data.byte_array);
+ strlcpy(dn, rcvmsg->msg_data.byte_array, SCIOC_DNSIZE);
kfree(rcvmsg);

/*
@@ -348,7 +348,7 @@ int sc_ioctl(int card, scs_ioctl *data)
pr_debug("%s: SCIOSTAT: ioctl received\n",
sc_adapter[card]->devicename);

- bi = kmalloc (sizeof(boardInfo), GFP_KERNEL);
+ bi = kzalloc(sizeof(boardInfo), GFP_KERNEL);
if (!bi) {
kfree(rcvmsg);
return -ENOMEM;



\
 
 \ /
  Last update: 2010-08-25 01:17    [W:0.245 / U:0.372 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site