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| author | Ard Biesheuvel <ardb@kernel.org> | 2021-03-02 21:33:03 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2021-03-12 14:04:01 +0100 |
| commit | 83681f2bebb34dbb3f03fecd8f570308ab8b7c2c (patch) | |
| tree | e77d6a6d5d4eb8a24caf9af6241ead46922c34b6 /include/crypto/rng.h | |
| parent | crypto: sun8i-ss - Fix memory leak of object d when dma_iv fails to map (diff) | |
| download | linux-83681f2bebb34dbb3f03fecd8f570308ab8b7c2c.tar.xz linux-83681f2bebb34dbb3f03fecd8f570308ab8b7c2c.zip | |
crypto: api - check for ERR pointers in crypto_destroy_tfm()
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>
Diffstat (limited to 'include/crypto/rng.h')
| -rw-r--r-- | include/crypto/rng.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/crypto/rng.h b/include/crypto/rng.h index 8b4b844b4eef..17bb3673d3c1 100644 --- a/include/crypto/rng.h +++ b/include/crypto/rng.h @@ -111,6 +111,8 @@ static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm) /** * crypto_free_rng() - zeroize and free RNG handle * @tfm: cipher handle to be freed + * + * If @tfm is a NULL or error pointer, this function does nothing. */ static inline void crypto_free_rng(struct crypto_rng *tfm) { |