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| author | Jakub Kicinski <kuba@kernel.org> | 2022-01-27 12:54:16 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-01-27 12:54:16 -0800 |
| commit | 72d044e4bfa6bd9096536e2e1c62aecfe1a525e4 (patch) | |
| tree | 0e408f181f5c704ff43cd006f4643c339e04aff1 /fs/cifs/misc.c | |
| parent | e2cf07654efb0fd7bbcb475c6f74be7b5755a8fd (diff) | |
| parent | 23a46422c56144939c091c76cf389aa863ce9c18 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
No conflicts.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'fs/cifs/misc.c')
| -rw-r--r-- | fs/cifs/misc.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 5148d48d6a35..56598f7dbe00 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -1302,4 +1302,53 @@ int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix) cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; return 0; } + +/** cifs_dfs_query_info_nonascii_quirk + * Handle weird Windows SMB server behaviour. It responds with + * STATUS_OBJECT_NAME_INVALID code to SMB2 QUERY_INFO request + * for "\<server>\<dfsname>\<linkpath>" DFS reference, + * where <dfsname> contains non-ASCII unicode symbols. + * + * Check such DFS reference and emulate -ENOENT if it is actual. + */ +int cifs_dfs_query_info_nonascii_quirk(const unsigned int xid, + struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, + const char *linkpath) +{ + char *treename, *dfspath, sep; + int treenamelen, linkpathlen, rc; + + treename = tcon->treeName; + /* MS-DFSC: All paths in REQ_GET_DFS_REFERRAL and RESP_GET_DFS_REFERRAL + * messages MUST be encoded with exactly one leading backslash, not two + * leading backslashes. + */ + sep = CIFS_DIR_SEP(cifs_sb); + if (treename[0] == sep && treename[1] == sep) + treename++; + linkpathlen = strlen(linkpath); + treenamelen = strnlen(treename, MAX_TREE_SIZE + 1); + dfspath = kzalloc(treenamelen + linkpathlen + 1, GFP_KERNEL); + if (!dfspath) + return -ENOMEM; + if (treenamelen) + memcpy(dfspath, treename, treenamelen); + memcpy(dfspath + treenamelen, linkpath, linkpathlen); + rc = dfs_cache_find(xid, tcon->ses, cifs_sb->local_nls, + cifs_remap(cifs_sb), dfspath, NULL, NULL); + if (rc == 0) { + cifs_dbg(FYI, "DFS ref '%s' is found, emulate -EREMOTE\n", + dfspath); + rc = -EREMOTE; + } else if (rc == -EEXIST) { + cifs_dbg(FYI, "DFS ref '%s' is not found, emulate -ENOENT\n", + dfspath); + rc = -ENOENT; + } else { + cifs_dbg(FYI, "%s: dfs_cache_find returned %d\n", __func__, rc); + } + kfree(dfspath); + return rc; +} #endif |