crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec

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[ Upstream commit 2397e92646 ]

authencesn assumes an ESP/ESN-formatted AAD. When assoclen is shorter than
the minimum expected length, crypto_authenc_esn_decrypt() can advance past
the end of the destination scatterlist and trigger a NULL pointer dereference
in scatterwalk_map_and_copy(), leading to a kernel panic (DoS).

Add a minimum AAD length check to fail fast on invalid inputs.

Fixes: 104880a6b4 ("crypto: authencesn - Convert to new AEAD interface")
Reported-By: Taeyang Lee <0wn@theori.io>
Signed-off-by: Taeyang Lee <0wn@theori.io>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Taeyang Lee 2026-01-16 16:03:58 +09:00 • committed by Greg Kroah-Hartman

parent abd9fc26ea

commit 161bdc90fc

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crypto/authencesn.c

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