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xcbgrab: Free the host string after checking the connection 

Prevent an use after free in the error message.

Bug-Id: CID 1274040
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2015-03-05 09:44:55 +01:00
parent 0025f7408a
commit 5f5b78aca3
1 changed files with 6 additions and 3 deletions
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9
libavdevice/xcbgrab.c
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@ -607,14 +607,17 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s)
c->conn = xcb_connect(host, &screen_num);
if (opts)
av_free(host);
if ((ret = xcb_connection_has_error(c->conn))) {
av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n",
s->filename[0] ? host : "default", ret);
if (opts)
av_freep(&host);
return AVERROR(EIO);
}
if (opts)
av_freep(&host);
setup = xcb_get_setup(c->conn);
c->screen = get_screen(setup, screen_num);