Fix double free when compressing empty files.

1 files changed, 2 insertions, 1 deletions

diff --git a/compress.c b/compress.c
index 3accc9a..59bd35c 100644
--- a/compress.c
+++ b/compress.c
@@ -29,7 +29,8 @@ static ssize_t read_data(FILE *in, uint8_t **pdata) {
 	if(ferror_unlocked(in)) goto fail;
 
 	uint8_t *r = realloc(data, len);
-	if(r) data = r;
+	if(len && !r) goto fail;
+	data = r;
 
 	*pdata = data;
 	return len;