From: Pali Rohár Date: Fri, 20 Sep 2024 23:29:33 +0000 (+0200) Subject: cifs: Validate content of WSL reparse point buffers X-Git-Tag: microblaze-v6.16~487^2~12 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=1f48660667efb97c3cf70485c7e1977af718b48b;p=linux-2.6-microblaze.git cifs: Validate content of WSL reparse point buffers 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 --- diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c index 732b3b51128b..e81d2d78ddb7 100644 --- a/fs/smb/client/reparse.c +++ b/fs/smb/client/reparse.c @@ -719,6 +719,11 @@ 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",