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

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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/000000000000de949705bc59e0f6@google.com/

Reported-by: syzbot+12cf5fbfdeba210a89dd@syzkaller.appspotmail.com
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2021-03-02 21:33:03 +01:00 • committed by Herbert Xu
parent 98b5ef3e97
commit 83681f2beb
8 changed files with 17 additions and 1 deletions
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2
include/crypto/aead.h
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@ -185,6 +185,8 @@ static inline struct crypto_tfm *crypto_aead_tfm(struct crypto_aead *tfm)
/**
* crypto_free_aead() - zeroize and free aead handle
* @tfm: cipher handle to be freed
*
* If @tfm is a NULL or error pointer, this function does nothing.
*/
static inline void crypto_free_aead(struct crypto_aead *tfm)
{