Fix previous: do not access the byte before the string if the string

is empty; found by jsg@ with afl(1).

1 files changed, 1 insertions, 1 deletions

diff --git a/roff.c b/roff.c
index 17dd8457..5792eb86 100644
--- a/roff.c
+++ b/roff.c
@@ -1236,7 +1236,7 @@ deroff(char **dest, const struct roff_node *n)
 	/* Skip trailing backslash. */
 
 	sz = strlen(cp);
-	if (cp[sz - 1] == '\\')
+	if (sz > 0 && cp[sz - 1] == '\\')
 		sz--;
 
 	/* Skip trailing whitespace. */