commit 5211b8c8bd321f8277cc2a08b18cc72e5259f87f
from: Stefan Sperling <stsp@stsp.name>
date: Tue Mar 19 12:26:23 2019 UTC

improve error checking around inflateInit()

commit - 23bc48a9950c0704e7698686e89a6980c23529f4
commit + 5211b8c8bd321f8277cc2a08b18cc72e5259f87f
blob - 28506a878c1f7f6d390a31f3b9960addcd1a3470
blob + d5a41ac80b86adcdf3016cddcccfd30b3f49a3ce
--- lib/inflate.c
+++ lib/inflate.c
@@ -16,6 +16,7 @@
 
 #include <sys/queue.h>
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -37,14 +38,21 @@ const struct got_error *
 got_inflate_init(struct got_inflate_buf *zb, uint8_t *outbuf, size_t bufsize)
 {
 	const struct got_error *err = NULL;
+	int zerr;
 
 	memset(&zb->z, 0, sizeof(zb->z));
 
 	zb->z.zalloc = Z_NULL;
 	zb->z.zfree = Z_NULL;
-	if (inflateInit(&zb->z) != Z_OK) {
-		err = got_error(GOT_ERR_IO);
-		goto done;
+	zerr = inflateInit(&zb->z);
+	if (zerr != Z_OK) {
+		if  (zerr == Z_ERRNO)
+			return got_error_from_errno();
+		if  (zerr == Z_MEM_ERROR) {
+			errno = ENOMEM;
+			return got_error_from_errno();
+		}
+		return got_error(GOT_ERR_DECOMPRESSION);
 	}
 
 	zb->inlen = zb->outlen = bufsize;