A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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crypto: ahash - ensure statesize is non-zero

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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: [email protected]
Signed-off-by: Russell King <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Russell King 2015-10-09 20:43:33 +01:00 • committed by Herbert Xu
commit 8996eafdcb
1 changed files with 2 additions and 1 deletions
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3
crypto/ahash.c
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@ -544,7 +544,8 @@ static int ahash_prepare_alg(struct ahash_alg *alg)
struct crypto_alg *base = &alg->halg.base;
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;
base->cra_type = &crypto_ahash_type;