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cifs: get rid of dup length check in parse_reparse_point()

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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>
This commit is contained in:
Paulo Alcantara 2024-01-06 20:05:18 -03:00 committed by Steve French
parent 6d039984c1
commit 8a3c4e44c2
2 changed files with 12 additions and 14 deletions
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14
fs/smb/client/cifssmb.c
View File

@ -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;

12
fs/smb/client/smb2ops.c
View File

@ -2947,18 +2947,6 @@ 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 */