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

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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>
This commit is contained in:
Taeyang Lee
2026-01-16 16:03:58 +09:00
committed by Herbert Xu
parent 961ac9d97b
commit 2397e92646
1 changed files with 6 additions and 0 deletions
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6
crypto/authencesn.c
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@@ -169,6 +169,9 @@ static int crypto_authenc_esn_encrypt(struct aead_request *req)
struct scatterlist *src, *dst;
int err;
if (assoclen < 8)
return -EINVAL;
sg_init_table(areq_ctx->src, 2);
src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
dst = src;
@@ -256,6 +259,9 @@ static int crypto_authenc_esn_decrypt(struct aead_request *req)
u32 tmp[2];
int err;
if (assoclen < 8)
return -EINVAL;
cryptlen -= authsize;
if (req->src != dst)