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crypto: api - check for ERR pointers in crypto_destroy_tfm()

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[ Upstream commit 83681f2bebb34dbb3f03fecd8f570308ab8b7c2c ]

Given that crypto_alloc_tfm() may return ERR pointers, and to avoid
crashes on obscure error paths where such pointers are presented to
crypto_destroy_tfm() (such as [0]), add an ERR_PTR check there
before dereferencing the second argument as a struct crypto_tfm
pointer.

[0] https://lore.kernel.org/linux-crypto/[email protected]/

Reported-by: [email protected]
Reviewed-by: Eric Biggers <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Ard Biesheuvel 2021-03-02 21:33:03 +01:00 • committed by Greg Kroah-Hartman
commit 69f1a9702d
8 changed files with 17 additions and 1 deletions
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2
crypto/api.c
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@ -568,7 +568,7 @@ void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
{
struct crypto_alg *alg;
if (unlikely(!mem))
if (IS_ERR_OR_NULL(mem))
return;
alg = tfm->__crt_alg;