6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pali Rohár <pali@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Stable-dep-of: cad3fc0a4c8c ("cifs: Throw -EOPNOTSUPP error on unsupported reparse point type from parse_reparse_point()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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",
--
2.39.5
