Commit 8996eafd authored by Russell King's avatar Russell King Committed by Herbert Xu

crypto: ahash - ensure statesize is non-zero

Unlike shash algorithms, ahash drivers must implement export
and import as their descriptors may contain hardware state and
cannot be exported as is.  Unfortunately some ahash drivers did
not provide them and end up causing crashes with algif_hash.

This patch adds a check to prevent these drivers from registering
ahash algorithms until they are fixed.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 92b27907
...@@ -544,7 +544,8 @@ static int ahash_prepare_alg(struct ahash_alg *alg) ...@@ -544,7 +544,8 @@ static int ahash_prepare_alg(struct ahash_alg *alg)
struct crypto_alg *base = &alg->halg.base; struct crypto_alg *base = &alg->halg.base;
if (alg->halg.digestsize > PAGE_SIZE / 8 || if (alg->halg.digestsize > PAGE_SIZE / 8 ||
alg->halg.statesize > PAGE_SIZE / 8) alg->halg.statesize > PAGE_SIZE / 8 ||
alg->halg.statesize == 0)
return -EINVAL; return -EINVAL;
base->cra_type = &crypto_ahash_type; base->cra_type = &crypto_ahash_type;
......
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