sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

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[ Upstream commit ff04b26794 ]

sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the
capacity limit for ep->auth_chunk_list, allowing it to hold up to
20 chunk entries (param_hdr.length up to 24). However, the copy
destination asoc->c.auth_chunks in struct sctp_cookie is only
SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16
chunks are added, sctp_association_init() memcpy overflows the
destination by up to 4 bytes.

Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching
the destination capacity.

Fixes: 1f485649f5 ("[SCTP]: Implement SCTP-AUTH internals")
Signed-off-by: HanQuan <eilaimemedsnaimel@gmail.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20260713032021.3491702-1-zhoujian.zja@antgroup.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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HanQuan 2026-07-13 03:20:21 +00:00 • committed by Greg Kroah-Hartman

parent 77cbe9c3a8

commit 6837c1c19a

1 changed files with 1 additions and 1 deletions

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net/sctp/auth.c

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