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crypto: algif_aead - fix uninitialized ctx->init 

In skcipher_accept_parent_nokey() the whole af_alg_ctx structure is
cleared by memset() after allocation, so add such memset() also to
aead_accept_parent_nokey() so that the new "init" field is also
initialized to zero. Without that the initial ctx->init checks might
randomly return true and cause errors.

While there, also remove the redundant zero assignments in both
functions.

Found via libkcapi testsuite.

Cc: Stephan Mueller <smueller@chronox.de>
Fixes: f3c802a1f3 ("crypto: algif_aead - Only wake up when ctx->more is zero")
Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ondrej Mosnacek 2020-08-12 14:58:25 +02:00 committed by Herbert Xu
parent 3cbfe80737
commit 21dfbcd1f5
2 changed files with 1 additions and 12 deletions
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6
crypto/algif_aead.c
View File

@ -558,12 +558,6 @@ static int aead_accept_parent_nokey(void *private, struct sock *sk)
INIT_LIST_HEAD(&ctx->tsgl_list);
ctx->len = len;
ctx->used = 0;
atomic_set(&ctx->rcvused, 0);
ctx->more = 0;
ctx->merge = 0;
ctx->enc = 0;
ctx->aead_assoclen = 0;
crypto_init_wait(&ctx->wait);
ask->private = ctx;

7
crypto/algif_skcipher.c
View File

@ -333,6 +333,7 @@ static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
ctx = sock_kmalloc(sk, len, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
memset(ctx, 0, len);
ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm),
GFP_KERNEL);
@ -340,16 +341,10 @@ static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
sock_kfree_s(sk, ctx, len);
return -ENOMEM;
}
memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
INIT_LIST_HEAD(&ctx->tsgl_list);
ctx->len = len;
ctx->used = 0;
atomic_set(&ctx->rcvused, 0);
ctx->more = 0;
ctx->merge = 0;
ctx->enc = 0;
crypto_init_wait(&ctx->wait);
ask->private = ctx;