From 42d9464f6f2ee0b3ccb3b11a8526722d200d32bf Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 2 Jun 2024 23:32:43 +0200 Subject: [PATCH] avdevice/xcbgrab: Check sscanf() return Alot more input checking can be performed, this is only checking the obvious missing case Fixes: CID1598562 Unchecked return value Sponsored-by: Sovereign Tech Fund Signed-off-by: Michael Niedermayer (cherry picked from commit 78d6d13babc62fa14727ee590e5a9661f23a0d9f) Signed-off-by: Michael Niedermayer --- libavdevice/xcbgrab.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/libavdevice/xcbgrab.c b/libavdevice/xcbgrab.c index 64a68ba497..e76af06331 100644 --- a/libavdevice/xcbgrab.c +++ b/libavdevice/xcbgrab.c @@ -826,7 +826,10 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s) if (!sscanf(s->url, "%[^+]+%d,%d", display_name, &c->x, &c->y)) { *display_name = 0; - sscanf(s->url, "+%d,%d", &c->x, &c->y); + if(sscanf(s->url, "+%d,%d", &c->x, &c->y) != 2) { + if (*s->url) + av_log(s, AV_LOG_WARNING, "Ambigous URL: %s\n", s->url); + } } c->conn = xcb_connect(display_name[0] ? display_name : NULL, &screen_num);