From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2A40852ED3D for ; Wed, 9 Sep 2026 10:45:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788950738; cv=none; b=jyO+UTES+x2GY/bzHffL9tmz20EUAQWrjgNbWc52IcJpCB0QURf0FxrlfsMt+NsDdE6t9VgcnJf/3Sino1GCbANRULXBS3KnrfENUizgITf5e50gNMVcI5tuomFYwxM/hyR/LGoy2hMeUYTM+X5NEBCtq4sW0QZPiPD1TUBiISc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788950738; c=relaxed/simple; bh=Dkn0MrRS4b5dxbw71LtlXhV07UoamO7vXIbXvoP8rVY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hJg4Y+CREsndgzRZrV2BFG6scTBPZRdSwc9vuRwu57aq0bwLwW3hGfZGWCIHItAGFJ8WS2R77U0KtI1Zw50yycvJa8/jWfegcYAaeUilAklVHYyaPZUvtz36LDhOwBcvTUOz8Iz1ykJ56OP9VQsZzKNRpXAZJDBhflTl1X8DhGY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jqorw4Fq; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jqorw4Fq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C4EB1F00A3A; Wed, 9 Sep 2026 10:45:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788950737; bh=15WpPoSY2jz0gqdk+MVcOpBqbikv7MnOodk4xtONICA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jqorw4Fq0KbNau4zXoEAsGyu4COi6qj6TQnWQS0yYJlpwWhHAH4hgkHrBmK5Fzagt 4X+8yO3iLRgbQfEQyaO5cNqDeh/q/Hi2OT9n0UV/Gr4MpRAyWSp7SLB8v7Mmc7lb9e 7NUhui06KVesQXvkSkzsCckVpB6L7A4Qnvm3KBgS2dlpZdCP4LhDnDQMgDaSNfEoY/ ScRS4cdWEJn7ElXl01wFuEk7rjdEPgnwOSSAjFKaJUaq5SpH4RP4kEcvffKwdgMFhy uMRyp8fWDmhOio3E4xuZ3bMuPTY7FIlwE9Uerz9LjoaMnI1tPSFbswgVKV1l63qch4 7h1Lmt8lUJckw== From: Sasha Levin To: stable@vger.kernel.org Cc: Oscar Ou , Chuck Lever , Sasha Levin Subject: [PATCH 6.6.y] lockd: fix swapped arguments in nlmsvc_match_ip() Date: Wed, 9 Sep 2026 06:45:34 -0400 Message-ID: <20260909104535.1562331-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090301-mustiness-immersion-c821@gregkh> References: <2026090301-mustiness-immersion-c821@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Oscar Ou [ Upstream commit b9060689f49dc663e9a3d069c4a65ff63a836e66 ] When releasing locks by server IP address via /proc/fs/nfsd/unlock_ip, nlmsvc_unlock_all_by_ip() calls nlm_traverse_files() with the server sockaddr as the opaque @data argument: nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL); The match callback is later invoked from nlm_traverse_locks() as: match(lockhost, host); where the first argument is the nlm_host that owns the lock, and the second argument is the @data that was originally passed down (here the server sockaddr). This is the convention every other match callback relies on (nlmsvc_mark_host(), nlmsvc_same_host(), nlmsvc_is_client()): arg1 is the real nlm_host, arg2 is the caller-supplied reference value. nlmsvc_match_ip() has had these two arguments reversed ever since the unlock-by-IP feature was introduced in commit 4373ea84c84d ("lockd: unlock lockd locks associated with a given server ip"): return rpc_cmp_addr(nlm_srcaddr(host), datap); Here @host is actually the server sockaddr, so nlm_srcaddr(host) dereferences a struct sockaddr as a struct nlm_host and reads garbage at the offset of h_srcaddr; meanwhile @datap is actually the lock owner's nlm_host but is compared as a sockaddr. As a result the comparison practically never matches and locks are not released for the requested IP. Swap the arguments so the lock owner's source address is compared against the requested server address: return rpc_cmp_addr(nlm_srcaddr(datap), (struct sockaddr *)host); Fixes: 4373ea84c84d ("lockd: unlock lockd locks associated with a given server ip") Cc: stable@vger.kernel.org Signed-off-by: Oscar Ou [ cel: fix the misleading typedef parameter names too ] Link: https://patch.msgid.link/20260617075738.1151797-1-oscarou@synology.com Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/lockd/svcsubs.c | 2 +- include/linux/lockd/lockd.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c index e64e0110f66b5..a967fcdd195f4 100644 --- a/fs/lockd/svcsubs.c +++ b/fs/lockd/svcsubs.c @@ -486,7 +486,7 @@ EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb); static int nlmsvc_match_ip(void *datap, struct nlm_host *host) { - return rpc_cmp_addr(nlm_srcaddr(host), datap); + return rpc_cmp_addr(nlm_srcaddr(datap), (struct sockaddr *)host); } /** diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index 0f016d69c996e..e1920a67d6572 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -268,7 +268,7 @@ void nsm_release(struct nsm_handle *nsm); * This is used in garbage collection and resource reclaim * A return value != 0 means destroy the lock/block/share */ -typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref); +typedef int (*nlm_host_match_fn_t)(void *owner, struct nlm_host *ref); /* * Server-side lock handling -- 2.53.0