diff options
| author | Colin Ian King <colin.king@canonical.com> | 2019-01-16 19:28:59 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-01-24 18:37:33 +0300 |
| commit | 73aaf920cc72024c4a4460cfa46d56e5014172f3 (patch) | |
| tree | 6bf117b2d46852bc042fca28fd0193c5b449a4fb /fs | |
| parent | 30bac164aca750892b93eef350439a0562a68647 (diff) | |
| download | linux-73aaf920cc72024c4a4460cfa46d56e5014172f3.tar.xz | |
cifs: fix memory leak of an allocated cifs_ntsd structure
The call to SMB2_queary_acl can allocate memory to pntsd and also
return a failure via a call to SMB2_query_acl (and then query_info).
This occurs when query_info allocates the structure and then in
query_info the call to smb2_validate_and_copy_iov fails. Currently the
failure just returns without kfree'ing pntsd hence causing a memory
leak.
Currently, *data is allocated if it's not already pointing to a buffer,
so it needs to be kfree'd only if was allocated in query_info, so the
fix adds an allocated flag to track this. Also set *dlen to zero on
an error just to be safe since *data is kfree'd.
Also set errno to -ENOMEM if the allocation of *data fails.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Dan Carpener <dan.carpenter@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 50811a7dc0e0..0af87bd0dc49 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -2816,6 +2816,7 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon, int resp_buftype = CIFS_NO_BUFFER; struct cifs_ses *ses = tcon->ses; int flags = 0; + bool allocated = false; cifs_dbg(FYI, "Query Info\n"); @@ -2855,14 +2856,21 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon, "Error %d allocating memory for acl\n", rc); *dlen = 0; + rc = -ENOMEM; goto qinf_exit; } + allocated = true; } } rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, min_len, *data); + if (rc && allocated) { + kfree(*data); + *data = NULL; + *dlen = 0; + } qinf_exit: SMB2_query_info_free(&rqst); |