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| author | Gilad Ben-Yossef <gilad@benyossef.com> | 2017-05-18 16:29:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-14 15:05:55 +0200 |
| commit | 2d0280070e6c3f0028ca462b59db5c0a45d36299 (patch) | |
| tree | a60fb097820f80434fe81c8bdc154ac8f6435f20 /crypto | |
| parent | d24c1c1977d80dcedf4e469be62f71644bf3383e (diff) | |
| download | linux-stable-2d0280070e6c3f0028ca462b59db5c0a45d36299.tar.gz linux-stable-2d0280070e6c3f0028ca462b59db5c0a45d36299.tar.bz2 linux-stable-2d0280070e6c3f0028ca462b59db5c0a45d36299.zip | |
crypto: drbg - wait for crypto op not signal safe
commit a5dfefb1c3f3db81662556393fd9283511e08430 upstream.
drbg_kcapi_sym_ctr() was using wait_for_completion_interruptible() to
wait for completion of async crypto op but if a signal occurs it
may return before DMA ops of HW crypto provider finish, thus
corrupting the output buffer.
Resolve this by using wait_for_completion() instead.
Reported-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/drbg.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c index 053035b5c8f8..123d211efa12 100644 --- a/crypto/drbg.c +++ b/crypto/drbg.c @@ -1768,9 +1768,8 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg, break; case -EINPROGRESS: case -EBUSY: - ret = wait_for_completion_interruptible( - &drbg->ctr_completion); - if (!ret && !drbg->ctr_async_err) { + wait_for_completion(&drbg->ctr_completion); + if (!drbg->ctr_async_err) { reinit_completion(&drbg->ctr_completion); break; } |