From: Marcelo Ricardo Leitner Date: Mon, 28 Jun 2021 19:13:43 +0000 (-0300) Subject: sctp: validate chunk size in __rcv_asconf_lookup X-Git-Tag: accepted/tizen/unified/20230118.172025~6711^2~7^2~7^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b6ffe7671b24689c09faa5675dd58f93758a97ae;p=platform%2Fkernel%2Flinux-rpi.git sctp: validate chunk size in __rcv_asconf_lookup In one of the fallbacks that SCTP has for identifying an association for an incoming packet, it looks for AddIp chunk (from ASCONF) and take a peek. Thing is, at this stage nothing was validating that the chunk actually had enough content for that, allowing the peek to happen over uninitialized memory. Similar check already exists in actual asconf handling in sctp_verify_asconf(). Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- diff --git a/net/sctp/input.c b/net/sctp/input.c index f72bff9..96dea80 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -1168,6 +1168,9 @@ static struct sctp_association *__sctp_rcv_asconf_lookup( union sctp_addr_param *param; union sctp_addr paddr; + if (ntohs(ch->length) < sizeof(*asconf) + sizeof(struct sctp_paramhdr)) + return NULL; + /* Skip over the ADDIP header and find the Address parameter */ param = (union sctp_addr_param *)(asconf + 1);