6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pali Rohár pali@kernel.org
[ 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 pali@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Stable-dep-of: cad3fc0a4c8c ("cifs: Throw -EOPNOTSUPP error on unsupported reparse point type from parse_reparse_point()") Signed-off-by: Sasha Levin sashal@kernel.org --- 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",