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x25: Prevent crashing when parsing bad X.25 facilities 

Now with improved comma support.

On parsing malformed X.25 facilities, decrementing the remaining length
may cause it to underflow.  Since the length is an unsigned integer,
this will result in the loop continuing until the kernel crashes.

This patch adds checks to ensure decrementing the remaining length does
not cause it to wrap around.

Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Rosenberg 2010-11-12 12:44:42 -08:00 committed by David S. Miller
parent e68e6133e2
commit 5ef41308f9
1 changed files with 9 additions and 3 deletions
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12
net/x25/x25_facilities.c
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@ -61,6 +61,8 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
while (len > 0) {
switch (*p & X25_FAC_CLASS_MASK) {
case X25_FAC_CLASS_A:
if (len < 2)
return 0;
switch (*p) {
case X25_FAC_REVERSE:
if((p[1] & 0x81) == 0x81) {
@ -104,6 +106,8 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
len -= 2;
break;
case X25_FAC_CLASS_B:
if (len < 3)
return 0;
switch (*p) {
case X25_FAC_PACKET_SIZE:
facilities->pacsize_in = p[1];
@ -125,6 +129,8 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
len -= 3;
break;
case X25_FAC_CLASS_C:
if (len < 4)
return 0;
printk(KERN_DEBUG "X.25: unknown facility %02X, "
"values %02X, %02X, %02X\n",
p[0], p[1], p[2], p[3]);
@ -132,6 +138,8 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
len -= 4;
break;
case X25_FAC_CLASS_D:
if (len < p[1] + 2)
return 0;
switch (*p) {
case X25_FAC_CALLING_AE:
if (p[1] > X25_MAX_DTE_FACIL_LEN || p[1] <= 1)
@ -149,9 +157,7 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
break;
default:
printk(KERN_DEBUG "X.25: unknown facility %02X,"
"length %d, values %02X, %02X, "
"%02X, %02X\n",
p[0], p[1], p[2], p[3], p[4], p[5]);
"length %d\n", p[0], p[1]);
break;
}
len -= p[1] + 2;