linux-kernel - [PATCH] xarray: Fix lock/unlock imbalance in xa

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Fri, 6 Jul 2018 08:10:44 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] xarray: Fix lock/unlock imbalance in xa_alloc

Release *xa_lock* before return.

Addresses-Coverity-ID: 1471631 ("Missing unlock")
Fixes: 29a6bfc32eb2 ("xarray: Track free entries in an XArray")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 lib/xarray.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/xarray.c b/lib/xarray.c
index be10039..a27fdb38 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1474,8 +1474,10 @@ int xa_alloc(struct xarray *xa, u32 *id, void *entry, gfp_t gfp)
 		xas.xa_index = 0;
 		xas_lock(&xas);
 		xas_find_tagged(&xas, UINT_MAX, XA_FREE_TAG);
-		if (xas.xa_node == XAS_BOUNDS && xas.xa_index == UINT_MAX + 1)
+		if (xas.xa_node == XAS_BOUNDS && xas.xa_index == UINT_MAX + 1) {
+			xas_unlock(&xas);
 			return -ENOSPC;
+		}
 		*id = xas.xa_index;
 		xas_store(&xas, entry);
 		xas_clear_tag(&xas, XA_FREE_TAG);
-- 
2.7.4