From: Karel Zak <kzak@redhat.com>
Date: Wed, 14 Apr 2021 14:25:30 +0000 (+0200)
Subject: libsmartcols: make buffers append function more robust
X-Git-Tag: v2.37-rc2~67
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=aac716f50355395ad2ba06524b19f690e321f118;p=thirdparty%2Futil-linux.git

libsmartcols: make buffers append function more robust

Fixes: https://github.com/karelzak/util-linux/issues/1279
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/libsmartcols/src/buffer.c b/libsmartcols/src/buffer.c
index d376e8fb81..8a313791fa 100644
--- 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);