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sctp: auth: discard auth_chunk when skb_clone fails

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When processing AUTH + COOKIE-ECHO packets, if skb_clone() fails
due to memory pressure, chunk->auth_chunk is NULL. The original
code still sets chunk->auth = 1 and continues, leaving the
COOKIE-ECHO to be processed without a valid auth_chunk for
deferred verification.

Discard the AUTH chunk early via pdiscard when skb_clone() fails,
so that the receive loop can continue processing remaining chunks
in the inqueue instead of stalling the entire packet.

Signed-off-by: Qing Luo <luoqing@kylinos.cn>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20260723061107.384106-1-l1138897701@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Qing Luo
2026-07-23 14:11:07 +08:00
committed by Jakub Kicinski
parent 2bb54b49e9
commit 9ae7ed101c
2 changed files with 8 additions and 0 deletions
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4
net/sctp/associola.c
View File

@@ -999,6 +999,10 @@ static void sctp_assoc_bh_rcv(struct work_struct *work)
if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
chunk->auth_chunk = skb_clone(chunk->skb,
GFP_ATOMIC);
if (!chunk->auth_chunk) {
chunk->pdiscard = 1;
continue;
}
chunk->auth = 1;
continue;
}

4
net/sctp/endpointola.c
View File

@@ -368,6 +368,10 @@ static void sctp_endpoint_bh_rcv(struct work_struct *work)
if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
chunk->auth_chunk = skb_clone(chunk->skb,
GFP_ATOMIC);
if (!chunk->auth_chunk) {
chunk->pdiscard = 1;
continue;
}
chunk->auth = 1;
continue;
}