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| author | Corentin Labbe <clabbe@baylibre.com> | 2018-11-29 14:42:21 +0000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-12-07 14:15:00 +0800 |
| commit | f7d76e05d058b832b373237566cc1af8251371b5 (patch) | |
| tree | 1b445b1e5904b27f826fe363056d63823f5f4e83 /crypto/rng.c | |
| parent | 76d09ea7c22f2cabf1f66ffc287c23b19b120be9 (diff) | |
| download | linux-f7d76e05d058b832b373237566cc1af8251371b5.tar.bz2 | |
crypto: user - fix use_after_free of struct xxx_request
All crypto_stats functions use the struct xxx_request for feeding stats,
but in some case this structure could already be freed.
For fixing this, the needed parameters (len and alg) will be stored
before the request being executed.
Fixes: cac5818c25d0 ("crypto: user - Implement a generic crypto statistics")
Reported-by: syzbot <syzbot+6939a606a5305e9e9799@syzkaller.appspotmail.com>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/rng.c')
| -rw-r--r-- | crypto/rng.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/crypto/rng.c b/crypto/rng.c index 2406501b90b7..33c38a72bff5 100644 --- a/crypto/rng.c +++ b/crypto/rng.c @@ -35,9 +35,11 @@ static int crypto_default_rng_refcnt; int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) { + struct crypto_alg *alg = tfm->base.__crt_alg; u8 *buf = NULL; int err; + crypto_stats_get(alg); if (!seed && slen) { buf = kmalloc(slen, GFP_KERNEL); if (!buf) @@ -50,7 +52,7 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) } err = crypto_rng_alg(tfm)->seed(tfm, seed, slen); - crypto_stat_rng_seed(tfm, err); + crypto_stats_rng_seed(alg, err); out: kzfree(buf); return err; |