Attachment 645003 Details for Bug 871620 – CVE-2012-4562-Fix-multiple-integer-overflows-in-buff.patch

[patch] CVE-2012-4562-Fix-multiple-integer-overflows-in-buff.patch

0002-CVE-2012-4562-Fix-multiple-integer-overflows-in-buff.patch (text/plain), 2.83 KB, created by Andreas Schneider on 2012-11-14 16:46:44 UTC

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Creator: Andreas Schneider

Created: 2012-11-14 16:46:44 UTC

Size: 2.83 KB

patch

obsolete

>From db81310d719878cc04b23e4033fbe19fa0b1f8a3 Mon Sep 17 00:00:00 2001
>From: Xi Wang <xi.wang@gmail.com>
>Date: Mon, 28 Nov 2011 04:42:54 -0500
>Subject: [PATCH 02/13] CVE-2012-4562: Fix multiple integer overflows in
> buffer-related functions.
>
>
>Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
>---
> src/buffer.c | 20 +++++++++++++++-----
> 1 file changed, 15 insertions(+), 5 deletions(-)
>
>diff --git a/src/buffer.c b/src/buffer.c
>index e68f16f..3ffe6de 100644
>--- a/src/buffer.c
>+++ b/src/buffer.c
>@@ -21,6 +21,7 @@
>  * MA 02111-1307, USA.
>  */
> 
>+#include <limits.h>
> #include <stdlib.h>
> #include <string.h>
> 
>@@ -181,6 +182,10 @@ int buffer_reinit(struct ssh_buffer_struct *buffer) {
>  */
> int buffer_add_data(struct ssh_buffer_struct *buffer, const void *data, uint32_t len) {
>   buffer_verify(buffer);
>+
>+  if (buffer->used + len < len)
>+    return -1;
>+
>   if (buffer->allocated < (buffer->used + len)) {
>     if(buffer->pos > 0)
>       buffer_shift(buffer);
>@@ -319,6 +324,8 @@ int buffer_prepend_data(struct ssh_buffer_struct *buffer, const void *data,
>     return 0;
>   }
>   /* pos isn't high enough */
>+  if (buffer->used - buffer->pos + len < len)
>+    return -1;
>   if (buffer->allocated < (buffer->used - buffer->pos + len)) {
>     if (realloc_buffer(buffer, buffer->used - buffer->pos + len) < 0) {
>       return -1;
>@@ -430,7 +437,7 @@ uint32_t buffer_get_rest_len(struct ssh_buffer_struct *buffer){
>  */
> uint32_t buffer_pass_bytes(struct ssh_buffer_struct *buffer, uint32_t len){
>     buffer_verify(buffer);
>-    if(buffer->used < buffer->pos+len)
>+    if (buffer->pos + len < len || buffer->used < buffer->pos + len)
>         return 0;
>     buffer->pos+=len;
>     /* if the buffer is empty after having passed the whole bytes into it, we can clean it */
>@@ -455,8 +462,11 @@ uint32_t buffer_pass_bytes(struct ssh_buffer_struct *buffer, uint32_t len){
>  */
> uint32_t buffer_pass_bytes_end(struct ssh_buffer_struct *buffer, uint32_t len){
>   buffer_verify(buffer);
>-  if(buffer->used < buffer->pos + len)
>-    return 0;
>+
>+  if (buffer->used < len) {
>+      return 0;
>+  }
>+
>   buffer->used-=len;
>   buffer_verify(buffer);
>   return len;
>@@ -549,7 +559,7 @@ struct ssh_string_struct *buffer_get_ssh_string(struct ssh_buffer_struct *buffer
>   }
>   hostlen = ntohl(stringlen);
>   /* verify if there is enough space in buffer to get it */
>-  if ((buffer->pos + hostlen) > buffer->used) {
>+  if (buffer->pos + hostlen < hostlen || buffer->pos + hostlen > buffer->used) {
>     return NULL; /* it is indeed */
>   }
>   str = ssh_string_new(hostlen);
>@@ -586,7 +596,7 @@ struct ssh_string_struct *buffer_get_mpint(struct ssh_buffer_struct *buffer) {
>   }
>   bits = ntohs(bits);
>   len = (bits + 7) / 8;
>-  if ((buffer->pos + len) > buffer->used) {
>+  if (buffer->pos + len < len || buffer->pos + len > buffer->used) {
>     return NULL;
>   }
>   str = ssh_string_new(len);
>-- 
>1.8.0
>

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