From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Fri, 21 Jul 2017 15:42:37 +0000 (+0100)
Subject: crypto: scompress - free partially allocated scratch buffers on failure
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cc4d110ec824d3f05f95b1f705158afc6fb08773;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

crypto: scompress - free partially allocated scratch buffers on failure

When allocating the per-CPU scratch buffers, we allocate the source
and destination buffers separately, but bail immediately if the second
allocation fails, without freeing the first one. Fix that.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/scompress.c b/crypto/scompress.c
index 0b40d991d65f..2c07648305ad 100644
--- a/crypto/scompress.c
+++ b/crypto/scompress.c
@@ -125,8 +125,11 @@ static int crypto_scomp_alloc_all_scratches(void)
 		if (!scomp_src_scratches)
 			return -ENOMEM;
 		scomp_dst_scratches = crypto_scomp_alloc_scratches();
-		if (!scomp_dst_scratches)
+		if (!scomp_dst_scratches) {
+			crypto_scomp_free_scratches(scomp_src_scratches);
+			scomp_src_scratches = NULL;
 			return -ENOMEM;
+		}
 	}
 	return 0;
 }