crypto: zstd - Fix compression bug caused by truncation

Use size_t for the return value of zstd_compress_cctx as otherwise
negative errors will be truncated to a positive value.

Reported-by: Han Xu <han.xu@nxp.com>
Fixes: f5ad93ffb541 ("crypto: zstd - convert to acomp")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: David Sterba <dsterba@suse.com>
Tested-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/zstd.c b/crypto/zstd.c
index c2a19cb0879d60e0b3a9d0e650db4ede6059551b..ac318d333b684787f0eac3f190dabf5606ef478c 100644 (file)
--- a/crypto/zstd.c
+++ b/crypto/zstd.c
@@ -83,7 +83,7 @@ static void zstd_exit(struct crypto_acomp *acomp_tfm)
 static int zstd_compress_one(struct acomp_req *req, struct zstd_ctx *ctx,
                             const void *src, void *dst, unsigned int *dlen)
 {
-       unsigned int out_len;
+       size_t out_len;
 
        ctx->cctx = zstd_init_cctx(ctx->wksp, ctx->wksp_size);
        if (!ctx->cctx)