From: Jo-Philipp Wich <jo@mein.io>
Date: Wed, 15 Feb 2017 22:42:58 +0000 (+0100)
Subject: libopkg: make checksum_bin2hex() and checksum_hex2bin() cope with NULL
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=55a9337ba2641555623b3faa5e2dc6607b0ba0f0;p=project%2Fopkg-lede.git

libopkg: make checksum_bin2hex() and checksum_hex2bin() cope with NULL

Those functions may be called with a NULL source pointer, especially during
pkg_merge(), so allow that to keep call sites simple.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---

diff --git a/libopkg/file_util.c b/libopkg/file_util.c
index 155d73b..b1d7930 100644
--- a/libopkg/file_util.c
+++ b/libopkg/file_util.c
@@ -241,7 +241,7 @@ char *checksum_bin2hex(const char *src, size_t len)
 		'c', 'd', 'e', 'f'
 	};
 
-	if (len > 32)
+	if (!s || len > 32)
 		return NULL;
 
 	for (p = buf; len > 0; s++, len--) {
@@ -261,6 +261,11 @@ char *checksum_hex2bin(const char *src, size_t *len)
 	const unsigned char *s = (unsigned char *)src;
 	static unsigned char buf[32];
 
+	if (!src) {
+		*len = 0;
+		return NULL;
+	}
+
 	while (isspace(*src))
 		src++;