[PATCH] Fix buffer overflow in config parser

[Thomas Jarosch <thomas.jarosch@xxxxxxxxxxxxx>]

Hello together,

attached is a small patch to fix a buffer overflow in config.c.
Patch is against git master's HEAD.

I didn't send this one inline as I wanted to
preserve the 1024+ byte long line.

Best regards,
Thomas Jarosch

Fix buffer overflow in config parser.

Segfaulting config looks like this:
---------------------------------------
[core]
        repositoryformatversion = 0
        filemode = true
        bare = false
        logallrefupdates = true
    foobar = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaxxxbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbcccccccccccccccccccccaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa123 4
---------------------------------------

Signed-off-by: Thomas Jarosch <thomas.jarosch@xxxxxxxxxxxxx>

diff --git a/config.c b/config.c
index b76fe4c..a9c67e8 100644
--- a/config.c
+++ b/config.c
@@ -72,7 +72,7 @@ static char *parse_value(void)
 			}
 		}
 		if (space) {
-			if (len)
+			if (len && len < sizeof(value)-1)
 				value[len++] = ' ';
 			space = 0;
 		}