[Asterisk-code-review] AST-2018-004: Restrict the number of Accept headers in a SUB... (asterisk[master])

[Joshua Colp]

Joshua Colp has uploaded this change for review. ( https://gerrit.asterisk.org/8321


Change subject: AST-2018-004: Restrict the number of Accept headers in a SUBSCRIBE.
......................................................................

AST-2018-004: Restrict the number of Accept headers in a SUBSCRIBE.

When receiving a SUBSCRIBE request the Accept headers from it are
stored locally. This operation has a fixed limit of 32 Accept headers
but this limit was not enforced. As a result it was possible for
memory outside of the allocated space to get written to resulting
in a crash.

This change enforces the limit so only 32 Accept headers are
processed.

ASTERISK-27640
Reported By: Sandro Gauci

Change-Id: I99a814b10b554b13a6021ccf41111e5bc95e7301
---
M res/res_pjsip_pubsub.c
1 file changed, 3 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/21/8321/1

diff --git a/res/res_pjsip_pubsub.c b/res/res_pjsip_pubsub.c
index c78f20c..69c256d 100644
--- a/res/res_pjsip_pubsub.c
+++ b/res/res_pjsip_pubsub.c
@@ -786,10 +786,11 @@
 	char accept[AST_SIP_MAX_ACCEPT][64];
 	size_t num_accept_headers = 0;
 
-	while ((accept_header = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_ACCEPT, accept_header->next))) {
+	while ((accept_header = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_ACCEPT, accept_header->next)) &&
+		(num_accept_headers < AST_SIP_MAX_ACCEPT)) {
 		int i;
 
-		for (i = 0; i < accept_header->count; ++i) {
+		for (i = 0; i < accept_header->count && num_accept_headers < AST_SIP_MAX_ACCEPT; ++i) {
 			if (!exceptional_accept(&accept_header->values[i])) {
 				ast_copy_pj_str(accept[num_accept_headers], &accept_header->values[i], sizeof(accept[num_accept_headers]));
 				++num_accept_headers;

-- 
To view, visit https://gerrit.asterisk.org/8321
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I99a814b10b554b13a6021ccf41111e5bc95e7301
Gerrit-Change-Number: 8321
Gerrit-PatchSet: 1
Gerrit-Owner: Joshua Colp <jcolp at digium.com>
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