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crypto: seqiv - Do not use req->iv after crypto_aead_encrypt

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As soon as crypto_aead_encrypt is called, the underlying request
may be freed by an asynchronous completion.  Thus dereferencing
req->iv after it returns is invalid.

Instead of checking req->iv against info, create a new variable
unaligned_info and use it for that purpose instead.

Fixes: 0a270321dbf9 ("[CRYPTO] seqiv: Add Sequence Number IV Generator")
Reported-by: Xiumei Mu <xmu@redhat.com>
Reported-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-12-17 14:15:41 +08:00
parent 8f0b4cce44
commit 50fdb78b7c
1 changed files with 5 additions and 3 deletions
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8
crypto/seqiv.c
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@ -50,6 +50,7 @@ static int seqiv_aead_encrypt(struct aead_request *req)
struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
struct aead_request *subreq = aead_request_ctx(req);
crypto_completion_t compl;
bool unaligned_info;
void *data;
u8 *info;
unsigned int ivsize = 8;
@ -68,8 +69,9 @@ static int seqiv_aead_encrypt(struct aead_request *req)
memcpy_sglist(req->dst, req->src,
req->assoclen + req->cryptlen);
if (unlikely(!IS_ALIGNED((unsigned long)info,
crypto_aead_alignmask(geniv) + 1))) {
unaligned_info = !IS_ALIGNED((unsigned long)info,
crypto_aead_alignmask(geniv) + 1);
if (unlikely(unaligned_info)) {
info = kmemdup(req->iv, ivsize, req->base.flags &
CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC);
@ -89,7 +91,7 @@ static int seqiv_aead_encrypt(struct aead_request *req)
scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
err = crypto_aead_encrypt(subreq);
if (unlikely(info != req->iv))
if (unlikely(unaligned_info))
seqiv_aead_encrypt_complete2(req, err);
return err;
}