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authorDan Carpenter <dan.carpenter@oracle.com>2020-01-20 17:38:04 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2020-02-13 11:58:09 +0300
commiteed74b3eba9eda36d155c11a12b2b4b50c67c1d8 (patch)
tree14b7a161d17ae097c8722fe498ee1fe588861b00 /crypto/rng.c
parent00e62e868ccd230e92c6f08ef2877ede10292882 (diff)
downloadlinux-eed74b3eba9eda36d155c11a12b2b4b50c67c1d8.tar.xz
crypto: rng - Fix a refcounting bug in crypto_rng_reset()
We need to decrement this refcounter on these error paths. Fixes: f7d76e05d058 ("crypto: user - fix use_after_free of struct xxx_request") Cc: <stable@vger.kernel.org> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/rng.c')
-rw-r--r--crypto/rng.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/crypto/rng.c b/crypto/rng.c
index 1e21231f71c9..1490d210f1a1 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -37,12 +37,16 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
crypto_stats_get(alg);
if (!seed && slen) {
buf = kmalloc(slen, GFP_KERNEL);
- if (!buf)
+ if (!buf) {
+ crypto_alg_put(alg);
return -ENOMEM;
+ }
err = get_random_bytes_wait(buf, slen);
- if (err)
+ if (err) {
+ crypto_alg_put(alg);
goto out;
+ }
seed = buf;
}