X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=extras%2Fusb_id%2Fusb_id.c;h=c4ce0c610365583c3f55635d905a84dbb51e1da8;hp=f5ee7959246a8d3a93653497ad0441988915aba7;hb=c907c823c388dfbdfa7054cfb2f4e9b92eb31e2e;hpb=853ccc433c4d45c3e1da4336f87b458ed10311ca

diff --git a/extras/usb_id/usb_id.c b/extras/usb_id/usb_id.c
index f5ee79592..c4ce0c610 100644
--- a/extras/usb_id/usb_id.c
+++ b/extras/usb_id/usb_id.c
@@ -82,7 +82,7 @@ static void set_str(char *to, const char *from, size_t count)
 
 	/* strip trailing whitespace */
 	len = strnlen(from, count);
-	while (isspace(from[len-1]))
+	while (len && isspace(from[len-1]))
 		len--;
 
 	/* strip leading whitespace */