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 1362643CECF; Tue, 21 Jul 2026 22:28:44 +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=1784672928; cv=none; b=DoDLRQCyrgJyFhahuMk6xcDT6DdczwzusJlf4TDJ4of2X2P+MYjCSxzyj3wP/BdkiaqWhBeSGQN0apjvqlrqhfuCD0tsbXB93+gijMu7pYJBrDnH0NFwbJ+POuYEizVkPPcDRE9msGzkPkwa94J8IxK349OddfDx4oJlEPL+TEU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672928; c=relaxed/simple; bh=3wh5moS9Tpsjvwy/yIfe1yy8uUH/6dKFfOuYo+SzEH0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ThzDsjn0BU7YJBLvOF1xd8ASYIFW1iHdOb8KKqlygCo5WMq+7fAb74RiWVBxjiH6GfMy8SE+BRDAeSiaHydR17LKp/QU6/fHVmQfeibgllJEOZxT+3BUaWlmK+GPF/B5x2HbSoew4lxR0wtnbQesywk56s12iD9rZl6uz6bWbII= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oUMLIcwK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oUMLIcwK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 989311F00A3F; Tue, 21 Jul 2026 22:28:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672923; bh=OM1DfFgJFBXNU7wXnRzTmvOYsbMZbXwSCGenrn9jiNo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oUMLIcwKA+n1nBHIwrmQkZl3xFaWjuBlhoWTAi6aNpvnvbqMzZftAOhM+HnZqZlCW jYtVlk4xlTxrBjs0BxC/deQAYqqC0JcaquZj9coqKMhW2/vt6eaSFOtTVrdf4ElCSX zcOjo5Prw7YOQy2/kTrhNQx5JcBVSCWIIS16vFeE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+6df204b70bf3261691c5@syzkaller.appspotmail.com, syzbot+e76bf3d19b85350571ac@syzkaller.appspotmail.com, Tristan Madani , Viacheslav Dubeyko , Sasha Levin Subject: [PATCH 5.15 807/843] hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length Date: Tue, 21 Jul 2026 17:27:22 +0200 Message-ID: <20260721152424.223938090@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ 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 Signed-off-by: Greg Kroah-Hartman --- fs/hfs/bnode.c | 2 +- fs/hfsplus/hfsplus_fs.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/fs/hfs/bnode.c +++ b/fs/hfs/bnode.c @@ -41,7 +41,7 @@ u32 check_and_correct_requested_length(s 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: " --- a/fs/hfsplus/hfsplus_fs.h +++ b/fs/hfsplus/hfsplus_fs.h @@ -611,7 +611,7 @@ u32 check_and_correct_requested_length(s 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: "