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 A1BAB30DD2A for ; Sat, 18 Jul 2026 11:44:32 +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=1784375073; cv=none; b=i9fVV4qbZqpuR4cWpenmv8I1SwvQjwpGyoao1MSzDlZkrgUpvPQSJZmGOJ4mf1jtrGe803kTxLq6g+E/cc7lDF1KOikkyITen5zHbVj+OxWFEKAlVK8QjlGp8MHMPkIv4gnvlmsWmVkFPwnmw5nNQAk2JNZxMUnz1eSndezfNmQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784375073; c=relaxed/simple; bh=v035PCJN4zBJz8sKaiLrP0wJENqHHQjtccPbKGh/mhc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ki5IXu9MQmUW0s1weFmlokSd2yUs9SEpEN38nXkANBAxP9Orq+OPCjeZq3lSMrnjd7kXl+YsFW/RtuNAGMHfUrevH5nuJS+PILsCR7OdHJ1tnq3GoEQ4M/BrzVxz5v31CxvSuHT8vZqCfTYokTNpstXGgQNf405TWcqyrJuEmIc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QJjtLnDG; 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="QJjtLnDG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A3AE1F00A3A; Sat, 18 Jul 2026 11:44:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784375072; bh=EgY3HP9LZfjjrPWv+fAk9but1qFkJgvN+mhTSvd4inY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QJjtLnDGfKjiRCLQyrT3uwKSJHmE+DxJFP6FsNETvrwfSOeba1lRT2w0FfQR6xwP5 lUzOXxnCLf2gBNFmWd+QRcnhhYKX0O2LdODnSeJM2dazAdF4Mt/B7FdP3P7TKpS/Vi ph+31qrBB7yLItcpzu82QMzM2bG21I8VfZsKKJH77CsCnGfT7dW/JoOuIgB+7dSqSx 4ytlVG/+LKrHDlQKTdFUu+cYA2gwpQSOW+bcuSgxveiK51e5wOgsJkXFZxZoQ2GKSb jRL7Y5MWeea0xz/tFgmRANHyZ4CjZpMfCW/EtAhyNW6ocQ7zRWTD25diaOuOiJlYAc oTIRlgU5UQvSQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Tristan Madani , syzbot+6df204b70bf3261691c5@syzkaller.appspotmail.com, syzbot+e76bf3d19b85350571ac@syzkaller.appspotmail.com, Viacheslav Dubeyko , Sasha Levin Subject: [PATCH 5.15.y 2/2] hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length Date: Sat, 18 Jul 2026 07:44:27 -0400 Message-ID: <20260718114427.3045393-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260718114427.3045393-1-sashal@kernel.org> References: <2026071427-alike-singing-16b5@gregkh> <20260718114427.3045393-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani [ Upstream commit 966cb76fb2857a4242cab6ea2ea17acf818a3da7 ] check_and_correct_requested_length() compares (off + len) against node_size using u32 arithmetic. When the caller passes a large len value (e.g. from an underflowed subtraction in hfs_brec_remove()), off + len can wrap past 2^32 and produce a small result, causing the bounds check to pass when it should fail. For example, with off=14 and len=0xFFFFFFF2 (underflowed from data_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6, which is less than a typical node_size of 512, so the check passes and the subsequent memmove reads ~4GB past the node buffer. Fix this by widening the addition to u64 before comparing against node_size. This prevents the u32 wrap while keeping the logic straightforward. Reported-by: syzbot+6df204b70bf3261691c5@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=6df204b70bf3261691c5 Tested-by: syzbot+6df204b70bf3261691c5@syzkaller.appspotmail.com Reported-by: syzbot+e76bf3d19b85350571ac@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=e76bf3d19b85350571ac Tested-by: syzbot+e76bf3d19b85350571ac@syzkaller.appspotmail.com Fixes: a431930c9bac ("hfs: fix slab-out-of-bounds in hfs_bnode_read()") Cc: stable@vger.kernel.org Signed-off-by: Tristan Madani Reviewed-by: Viacheslav Dubeyko Signed-off-by: Viacheslav Dubeyko Link: https://lore.kernel.org/r/20260505111300.3592757-2-tristmd@gmail.com Signed-off-by: Viacheslav Dubeyko Signed-off-by: Sasha Levin --- fs/hfs/bnode.c | 2 +- fs/hfsplus/hfsplus_fs.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/hfs/bnode.c b/fs/hfs/bnode.c index 1f72af8ec2aa87..8d988ca0ea8b28 100644 --- a/fs/hfs/bnode.c +++ b/fs/hfs/bnode.c @@ -41,7 +41,7 @@ u32 check_and_correct_requested_length(struct hfs_bnode *node, u32 off, u32 len) node_size = node->tree->node_size; - if ((off + len) > node_size) { + if ((u64)off + len > node_size) { u32 new_len = node_size - off; pr_err("requested length has been corrected: " diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h index b3cb05deff3ad2..ef8c087098853c 100644 --- a/fs/hfsplus/hfsplus_fs.h +++ b/fs/hfsplus/hfsplus_fs.h @@ -611,7 +611,7 @@ u32 check_and_correct_requested_length(struct hfs_bnode *node, u32 off, u32 len) node_size = node->tree->node_size; - if ((off + len) > node_size) { + if ((u64)off + len > node_size) { u32 new_len = node_size - off; pr_err("requested length has been corrected: " -- 2.53.0