crypto: caam - fix signals handling

commit 7459e1d25ffefa2b1be799477fcc1f6c62f6cec7 upstream.

Driver does not properly handle the case when signals interrupt
wait_for_completion_interruptible():
-it does not check for return value
-completion structure is allocated on stack; in case a signal interrupts
the sleep, it will go out of scope, causing the worker thread
(caam_jr_dequeue) to fail when it accesses it

wait_for_completion_interruptible() is replaced with uninterruptable
wait_for_completion().
We choose to block all signals while waiting for I/O (device executing
the split key generation job descriptor) since the alternative - in
order to have a deterministic device state - would be to flush the job
ring (aborting *all* in-progress jobs).

Fixes: 045e36780f115 ("crypto: caam - ahash hmac support")
Fixes: 4c1ec1f930154 ("crypto: caam - refactor key_gen, sg")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 2474f14..631337c 100644 (file)
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -491,7 +491,7 @@ static int hash_digest_key(struct caam_hash_ctx *ctx, const u8 *key_in,
        ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
        if (!ret) {
                /* in progress */
-               wait_for_completion_interruptible(&result.completion);
+               wait_for_completion(&result.completion);
                ret = result.err;
 #ifdef DEBUG
                print_hex_dump(KERN_ERR,

diff --git a/drivers/crypto/caam/key_gen.c b/drivers/crypto/caam/key_gen.c
index e1eaf4f..3ce1d5c 100644 (file)
--- a/drivers/crypto/caam/key_gen.c
+++ b/drivers/crypto/caam/key_gen.c
@@ -103,7 +103,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len,
        ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
        if (!ret) {
                /* in progress */
-               wait_for_completion_interruptible(&result.completion);
+               wait_for_completion(&result.completion);
                ret = result.err;
 #ifdef DEBUG
                print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",