crypto: scompress - return proper error code for allocation failure

If scomp_acomp_comp_decomp() fails to allocate memory for the
destination then we never copy back the data we compressed.
It is probably best to return an error code instead 0 in case of
failure.
I haven't found any user that is using acomp_request_set_params()
without the `dst' buffer so there is probably no harm.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 3 insertions, 1 deletions

diff --git a/crypto/scompress.c b/crypto/scompress.c
index 6f8305f8c300..aea1a8e5d195 100644
--- a/crypto/scompress.c
+++ b/crypto/scompress.c
@@ -171,8 +171,10 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
         if (!ret) {
                 if (!req->dst) {
                         req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
-                        if (!req->dst)
+                        if (!req->dst) {
+                                ret = -ENOMEM;
                                 goto out;
+                        }
                 }
                 scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen,
                                          1);