This is a note to let you know that I've just added the patch titled sctp: validate chunk size in __rcv_asconf_lookup to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sctp-validate-chunk-size-in-__rcv_asconf_lookup.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b6ffe7671b24689c09faa5675dd58f93758a97ae Mon Sep 17 00:00:00 2001 From: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Date: Mon, 28 Jun 2021 16:13:43 -0300 Subject: sctp: validate chunk size in __rcv_asconf_lookup From: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> commit b6ffe7671b24689c09faa5675dd58f93758a97ae upstream. 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 <marcelo.leitner@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/sctp/input.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -1168,6 +1168,9 @@ static struct sctp_association *__sctp_r 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); Patches currently in stable-queue which might be from marcelo.leitner@xxxxxxxxx are queue-5.10/sctp-add-param-size-validation-for-sctp_param_set_primary.patch queue-5.10/sctp-validate-chunk-size-in-__rcv_asconf_lookup.patch