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cifsd: Pass string length parameter to match_pattern()

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When iterating through a directory, a file's name may not be
null-terminated (depending on the underlying filesystem implementation).

Modify match_pattern to take the string's length into account when matching
it against the request pattern.

Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2021-03-21 17:32:19 +09:00 committed by Steve French
parent 548e9ad317
commit b24c933580
4 changed files with 9 additions and 5 deletions
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7
fs/cifsd/misc.c
View file

@ -22,20 +22,22 @@
* TODO : implement consideration about DOS_DOT, DOS_QM and DOS_STAR
*
* @string: string to compare with a pattern
* @len: string length
* @pattern: pattern string which might include wildcard '*' and '?'
*
* Return: 0 if pattern matched with the string, otherwise non zero value
*/
int match_pattern(const char *str, const char *pattern)
int match_pattern(const char *str, size_t len, const char *pattern)
{
const char *s = str;
const char *p = pattern;
bool star = false;
while (*s) {
while (*s && len) {
switch (*p) {
case '?':
s++;
len--;
p++;
break;
case '*':
@ -48,6 +50,7 @@ int match_pattern(const char *str, const char *pattern)
default:
if (tolower(*s) == tolower(*p)) {
s++;
len--;
p++;
} else {
if (!star)

2
fs/cifsd/misc.h
View file

@ -11,7 +11,7 @@ struct nls_table;
struct kstat;
struct ksmbd_file;
int match_pattern(const char *str, const char *pattern);
int match_pattern(const char *str, size_t len, const char *pattern);
int ksmbd_validate_filename(char *filename);

2
fs/cifsd/smb2pdu.c
View file

@ -3837,7 +3837,7 @@ static int __query_dir(struct dir_context *ctx,
return 0;
if (ksmbd_share_veto_filename(priv->work->tcon->share_conf, name))
return 0;
if (!match_pattern(name, priv->search_pattern))
if (!match_pattern(name, namlen, priv->search_pattern))
return 0;
d_info->name = name;

3
fs/cifsd/smb_common.c
View file

@ -294,7 +294,8 @@ int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work,
d_info->name_len = 2;
}
if (!match_pattern(d_info->name, search_pattern)) {
if (!match_pattern(d_info->name, d_info->name_len,
search_pattern)) {
dir->dot_dotdot[i] = 1;
continue;
}