From b2bccc729b933a9f0f982ee05f7cf0c59a32311b Mon Sep 17 00:00:00 2001 From: =?utf8?q?Pali=20Roh=C3=A1r?= Date: Sat, 21 Sep 2024 01:29:33 +0200 Subject: [PATCH] cifs: Validate content of WSL reparse point buffers MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit [ Upstream commit 1f48660667efb97c3cf70485c7e1977af718b48b ] WSL socket, fifo, char and block devices have empty reparse buffer. Validate the length of the reparse buffer. Signed-off-by: Pali Rohár Signed-off-by: Steve French Stable-dep-of: cad3fc0a4c8c ("cifs: Throw -EOPNOTSUPP error on unsupported reparse point type from parse_reparse_point()") Signed-off-by: Sasha Levin --- fs/smb/client/reparse.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c index e56a8df23fec9..bd8808e50d127 100644 --- a/fs/smb/client/reparse.c +++ b/fs/smb/client/reparse.c @@ -651,6 +651,11 @@ int parse_reparse_point(struct reparse_data_buffer *buf, case IO_REPARSE_TAG_LX_FIFO: case IO_REPARSE_TAG_LX_CHR: case IO_REPARSE_TAG_LX_BLK: + if (le16_to_cpu(buf->ReparseDataLength) != 0) { + cifs_dbg(VFS, "srv returned malformed buffer for reparse point: 0x%08x\n", + le32_to_cpu(buf->ReparseTag)); + return -EIO; + } break; default: cifs_tcon_dbg(VFS | ONCE, "unhandled reparse tag: 0x%08x\n", -- 2.47.3