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steam-ihs: fix memleak on exception 

When protobuf_dissect_unknown_field throws an exception,
steamdiscover_dissect_body_status will leak memory as
wmem_destroy_allocator is not called. Capture fuzz-2018-10-06-3104.pcap
from the linked bug leaks 64kiB memory in each frame 14 and 36.

Bug: 15171
Change-Id: I930d0738fde61799ab4ef2310f8ff11c1bcb032b
Fixes: v2.5.1rc0-130-g7ae954c7ac ("steam-ihs: Add dissector for the Steam IHS Discovery Protocol")
Reviewed-on: https://code.wireshark.org/review/30098
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>
This commit is contained in:
Peter Wu 2018-10-09 18:16:11 +02:00 committed by Anders Broman
parent 0d812e0a0c
commit f3986c2472
1 changed files with 2 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
epan/dissectors/packet-steam-ihs-discovery.c
View File

@ -491,9 +491,7 @@ steamdiscover_dissect_body_status(tvbuff_t *tvb, packet_info *pinfo, proto_tree
protobuf_desc_t pb = { tvb, offset, bytes_left };
protobuf_desc_t pb2 = { tvb, 0, 0 };
protobuf_tag_t tag = { 0, 0, 0 };
wmem_allocator_t* strpool;
guint8 *hostname;
strpool = wmem_allocator_new(WMEM_ALLOCATOR_SIMPLE);
nstime_t timestamp;
proto_tree *user_tree;
proto_item *user_it;
@ -522,7 +520,7 @@ steamdiscover_dissect_body_status(tvbuff_t *tvb, packet_info *pinfo, proto_tree
value = get_varint64(pb.tvb, pb.offset, pb.bytes_left, &len);
proto_tree_add_item(tree, hf_steam_ihs_discovery_body_status_hostname, pb.tvb,
pb.offset+len, (gint)value, ENC_UTF_8|ENC_NA);
hostname = tvb_get_string_enc(strpool, pb.tvb, pb.offset+len, (gint)value, ENC_UTF_8);
hostname = tvb_get_string_enc(wmem_packet_scope(), pb.tvb, pb.offset+len, (gint)value, ENC_UTF_8);
if(hostname && strlen(hostname)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s from %s", hf_steam_ihs_discovery_header_msgtype_strings[STEAMDISCOVER_MSGTYPE_CLIENTBROADCASTMSGSTATUS].strptr, hostname);
}
@ -615,7 +613,6 @@ steamdiscover_dissect_body_status(tvbuff_t *tvb, packet_info *pinfo, proto_tree
}
protobuf_seek_forward(&pb, len);
}
wmem_destroy_allocator(strpool);
}
/* Dissect a CMsgRemoteDeviceAuthorizationRequest protobuf message body.
@ -648,8 +645,6 @@ steamdiscover_dissect_body_authrequest(tvbuff_t *tvb, packet_info *pinfo, proto_
gint64 value;
protobuf_desc_t pb = { tvb, offset, bytes_left };
protobuf_tag_t tag = { 0, 0, 0 };
wmem_allocator_t *strpool;
strpool = wmem_allocator_new(WMEM_ALLOCATOR_SIMPLE);
guint8* devicename;
while (protobuf_iter_next(&pb, &tag)) {
switch(tag.field_number) {
@ -665,7 +660,7 @@ steamdiscover_dissect_body_authrequest(tvbuff_t *tvb, packet_info *pinfo, proto_
value = get_varint64(pb.tvb, pb.offset, pb.bytes_left, &len);
proto_tree_add_item(tree, hf_steam_ihs_discovery_body_authrequest_devicename, pb.tvb,
pb.offset+len, (gint)value, ENC_UTF_8|ENC_NA);
devicename = tvb_get_string_enc(strpool, pb.tvb, pb.offset+len, (gint)value, ENC_UTF_8);
devicename = tvb_get_string_enc(wmem_packet_scope(), pb.tvb, pb.offset+len, (gint)value, ENC_UTF_8);
if (devicename && strlen(devicename)) {
col_append_fstr(pinfo->cinfo, COL_INFO, " from %s", devicename);
}
@ -684,7 +679,6 @@ steamdiscover_dissect_body_authrequest(tvbuff_t *tvb, packet_info *pinfo, proto_
}
protobuf_seek_forward(&pb, len);
}
wmem_destroy_allocator(strpool);
}
/* Dissect a CMsgRemoteDeviceAuthorizationResponse protobuf message body.