6.6-stable review patch. If anyone has any objections, please let me know.
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From: Paulo Alcantara pc@manguebit.com
[ Upstream commit 8a3c4e44c243308c2364a00f9944c3d6fbdeb125 ]
smb2_compound_op(SMB2_OP_GET_REPARSE) already checks if ioctl response has a valid reparse data buffer's length, so there's no need to check it again in parse_reparse_point().
In order to get rid of duplicate check, validate reparse data buffer's length also in cifs_query_reparse_point().
Signed-off-by: Paulo Alcantara (SUSE) pc@manguebit.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/client/cifssmb.c | 14 ++++++++++++-- fs/smb/client/smb2ops.c | 12 ------------ 2 files changed, 12 insertions(+), 14 deletions(-)
diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c index e9e33b0b3ac47..01e89070df5ab 100644 --- a/fs/smb/client/cifssmb.c +++ b/fs/smb/client/cifssmb.c @@ -2700,11 +2700,12 @@ int cifs_query_reparse_point(const unsigned int xid, u32 *tag, struct kvec *rsp, int *rsp_buftype) { + struct reparse_data_buffer *buf; struct cifs_open_parms oparms; TRANSACT_IOCTL_REQ *io_req = NULL; TRANSACT_IOCTL_RSP *io_rsp = NULL; struct cifs_fid fid; - __u32 data_offset, data_count; + __u32 data_offset, data_count, len; __u8 *start, *end; int io_rsp_len; int oplock = 0; @@ -2774,7 +2775,16 @@ int cifs_query_reparse_point(const unsigned int xid, goto error; }
- *tag = le32_to_cpu(((struct reparse_data_buffer *)start)->ReparseTag); + data_count = le16_to_cpu(io_rsp->ByteCount); + buf = (struct reparse_data_buffer *)start; + len = sizeof(*buf); + if (data_count < len || + data_count < le16_to_cpu(buf->ReparseDataLength) + len) { + rc = -EIO; + goto error; + } + + *tag = le32_to_cpu(buf->ReparseTag); rsp->iov_base = io_rsp; rsp->iov_len = io_rsp_len; *rsp_buftype = CIFS_LARGE_BUFFER; diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 9b7cdb7d7ece8..3e07ab1564ea7 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -2946,18 +2946,6 @@ int parse_reparse_point(struct reparse_data_buffer *buf, u32 plen, struct cifs_sb_info *cifs_sb, bool unicode, struct cifs_open_info_data *data) { - if (plen < sizeof(*buf)) { - cifs_dbg(VFS, "%s: reparse buffer is too small. Must be at least 8 bytes but was %d\n", - __func__, plen); - return -EIO; - } - - if (plen < le16_to_cpu(buf->ReparseDataLength) + sizeof(*buf)) { - cifs_dbg(VFS, "%s: invalid reparse buf length: %d\n", - __func__, plen); - return -EIO; - } - data->reparse.buf = buf;
/* See MS-FSCC 2.1.2 */