From: "Stephan M�ller" smueller@chronox.de
commit 819966c06b759022e9932f328284314d9272b9f3 upstream.
The Jitter RNG is unconditionally allocated as a seed source follwoing the patch 97f2650e5040. Thus, the instance must always be deallocated.
Reported-by: syzbot+2e635807decef724a1fa@syzkaller.appspotmail.com Fixes: 97f2650e5040 ("crypto: drbg - always seeded with SP800-90B ...") Signed-off-by: Stephan Mueller smueller@chronox.de Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- crypto/drbg.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/crypto/drbg.c +++ b/crypto/drbg.c @@ -1647,10 +1647,12 @@ static int drbg_uninstantiate(struct drb if (drbg->random_ready.notifier_call) { unregister_random_ready_notifier(&drbg->random_ready); cancel_work_sync(&drbg->seed_work); - crypto_free_rng(drbg->jent); - drbg->jent = NULL; }
+ if (!IS_ERR_OR_NULL(drbg->jent)) + crypto_free_rng(drbg->jent); + drbg->jent = NULL; + if (drbg->d_ops) drbg->d_ops->crypto_fini(drbg); drbg_dealloc_state(drbg);