From f818a69b3d70922511583302177666029bec1d26 Mon Sep 17 00:00:00 2001
From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Wed, 3 Jun 2020 21:42:25 +0200
Subject: [PATCH] libpkgconf: pkg: fix out ouf boundary access

If a file with a matching "uninstalled" name exists but cannot be
parsed, an invalid memory area is accessed.

How to reproduce:
$ touch poc-uninstalled.pc
$ PKG_CONFIG_PATH=. pkgconf poc
---
 libpkgconf/pkg.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libpkgconf/pkg.c b/libpkgconf/pkg.c
index 214f544..d420938 100644
--- a/libpkgconf/pkg.c
+++ b/libpkgconf/pkg.c
@@ -539,7 +539,8 @@ pkgconf_pkg_try_specific_path(pkgconf_client_t *client, const char *path, const
 	{
 		PKGCONF_TRACE(client, "found (uninstalled): %s", uninst_locbuf);
 		pkg = pkgconf_pkg_new_from_file(client, uninst_locbuf, f);
-		pkg->flags |= PKGCONF_PKG_PROPF_UNINSTALLED;
+		if (pkg != NULL)
+			pkg->flags |= PKGCONF_PKG_PROPF_UNINSTALLED;
 	}
 	else if ((f = fopen(locbuf, "r")) != NULL)
 	{