conf: fix invalid memory access in strip_spaces()

We must not assume that the string is longer than 0 characters. Therefore,
check whether we would access invalid memory before the string when
removing trailing whitespaces.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/conf.c b/src/conf.c
index aae439e..8ff2892 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -385,6 +385,9 @@ static void strip_spaces(char **buf)
 	while (**buf == ' ' || **buf == '\r' || **buf == '\t')
 		++*buf;
 
+	if (!**buf)
+		return;
+
 	tail = *buf;
 	while (*tail)
 		++tail;