libsmartcols: make buffers append function more robust

Fixes: https://github.com/karelzak/util-linux/issues/1279 Signed-off-by: Karel Zak <kzak@redhat.com>
2021-04-14 16:25:30 +02:00 · 2021-04-14 16:25:30 +02:00 · aac716f503
parent 91f6895fff
commit aac716f503
1 changed files with 2 additions and 0 deletions
--- a/libsmartcols/src/buffer.c
+++ b/libsmartcols/src/buffer.c
@ -56,6 +56,8 @@ int buffer_append_data(struct libscols_buffer *buf, const char *str)
 		return -EINVAL;
 	if (!str || !*str)
 		return 0;
+	if (!buf->cur || !buf->begin)
+		return -EINVAL;

 	sz = strlen(str);
 	maxsz = buf->bufsz - (buf->cur - buf->begin);