linux-kernel - [PATCH 2/3] fpga: region: release FPGA region reference in error path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20170424213422.3190-3-atull@kernel.org>
Date:   Mon, 24 Apr 2017 16:34:21 -0500
From:   Alan Tull <atull@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Moritz Fischer <moritz.fischer@...us.com>,
        Alan Tull <atull@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org, Tobias Klauser <tklauser@...tanz.ch>
Subject: [PATCH 2/3] fpga: region: release FPGA region reference in error path

From: Tobias Klauser <tklauser@...tanz.ch>

If fpga_region_get_manager() fails in fpga_region_program_fpga(), a
reference to the fpga_manager instance previously acquired through
fpga_region_get() is retained. Make sure to properly release it in the
error case by using a separate jump label which will call
fpga_region_put() in before returning.

Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>
Acked-by: Moritz Fischer <mdf@...nel.org>
Signed-off-by: Alan Tull <atull@...nel.org>
---
 drivers/fpga/fpga-region.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index ae4c61a..3b6b2f4 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -245,7 +245,8 @@ static int fpga_region_program_fpga(struct fpga_region *region,
 	mgr = fpga_region_get_manager(region);
 	if (IS_ERR(mgr)) {
 		pr_err("failed to get fpga region manager\n");
-		return PTR_ERR(mgr);
+		ret = PTR_ERR(mgr);
+		goto err_put_region;
 	}
 
 	ret = fpga_region_get_bridges(region, overlay);
@@ -281,6 +282,7 @@ static int fpga_region_program_fpga(struct fpga_region *region,
 	fpga_bridges_put(&region->bridge_list);
 err_put_mgr:
 	fpga_mgr_put(mgr);
+err_put_region:
 	fpga_region_put(region);
 
 	return ret;
-- 
2.7.4