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cifs: Fix removexattr for os2.* xattrs

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If cifs_removexattr finds a "user." or "os2." xattr name prefix, it
skips 5 bytes, one byte too many for "os2.".

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-04-14 00:30:15 +02:00 committed by Al Viro
parent 45987e006c
commit 534bb0c7bd
1 changed files with 17 additions and 9 deletions
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26
fs/cifs/xattr.c
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@ -61,15 +61,7 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
}
if (ea_name == NULL) {
cifs_dbg(FYI, "Null xattr names not supported\n");
} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
&& (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
cifs_dbg(FYI,
"illegal xattr request %s (only user namespace supported)\n",
ea_name);
/* BB what if no namespace prefix? */
/* Should we just pass them to server, except for
system and perhaps security prefixes? */
} else {
} else if (!strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
goto remove_ea_exit;
@ -78,6 +70,22 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
full_path, ea_name, NULL, (__u16)0,
cifs_sb->local_nls, cifs_remap(cifs_sb));
} else if (!strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
goto remove_ea_exit;
ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
if (pTcon->ses->server->ops->set_EA)
rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
full_path, ea_name, NULL, (__u16)0,
cifs_sb->local_nls, cifs_remap(cifs_sb));
} else {
cifs_dbg(FYI,
"illegal xattr request %s (only user namespace supported)\n",
ea_name);
/* BB what if no namespace prefix? */
/* Should we just pass them to server, except for
system and perhaps security prefixes? */
}
remove_ea_exit:
kfree(full_path);