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cifs: fix unaligned accesses in cifsConvertToUCS

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Move cifsConvertToUCS to cifs_unicode.c where all of the other unicode
related functions live. Have it store mapped characters in 'temp' and
then use put_unaligned_le16 to copy it to the target buffer. Also fix
the comments to match kernel coding style.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2011-01-20 13:36:51 -05:00 • committed by Steve French
commit 84cdf74e80
2 changed files with 76 additions and 71 deletions
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76
fs/cifs/cifs_unicode.c
View file

@ -257,3 +257,79 @@ cifs_strndup_from_ucs(const char *src, const int maxlen, const bool is_unicode,
return dst;
}
/*
* Convert 16 bit Unicode pathname to wire format from string in current code
* page. Conversion may involve remapping up the six characters that are
* only legal in POSIX-like OS (if they are present in the string). Path
* names are little endian 16 bit Unicode on the wire
*/
int
cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
const struct nls_table *cp, int mapChars)
{
int i, j, charlen;
int len_remaining = maxlen;
char src_char;
__u16 temp;
if (!mapChars)
return cifs_strtoUCS(target, source, PATH_MAX, cp);
for (i = 0, j = 0; i < maxlen; j++) {
src_char = source[i];
switch (src_char) {
case 0:
put_unaligned_le16(0, &target[j]);
goto ctoUCS_out;
case ':':
temp = UNI_COLON;
break;
case '*':
temp = UNI_ASTERIK;
break;
case '?':
temp = UNI_QUESTION;
break;
case '<':
temp = UNI_LESSTHAN;
break;
case '>':
temp = UNI_GRTRTHAN;
break;
case '|':
temp = UNI_PIPE;
break;
/*
* FIXME: We can not handle remapping backslash (UNI_SLASH)
* until all the calls to build_path_from_dentry are modified,
* as they use backslash as separator.
*/
default:
charlen = cp->char2uni(source+i, len_remaining,
&temp);
/*
* if no match, use question mark, which at least in
* some cases serves as wild card
*/
if (charlen < 1) {
temp = 0x003f;
charlen = 1;
}
len_remaining -= charlen;
/*
* character may take more than one byte in the source
* string, but will take exactly two bytes in the
* target string
*/
i += charlen;
continue;
}
put_unaligned_le16(temp, &target[j]);
i++; /* move to next char in source string */
len_remaining--;
}
ctoUCS_out:
return i;
}

71
fs/cifs/misc.c
View file

@ -637,77 +637,6 @@ dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
return;
}
/* Convert 16 bit Unicode pathname to wire format from string in current code
page. Conversion may involve remapping up the seven characters that are
only legal in POSIX-like OS (if they are present in the string). Path
names are little endian 16 bit Unicode on the wire */
int
cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
const struct nls_table *cp, int mapChars)
{
int i, j, charlen;
int len_remaining = maxlen;
char src_char;
__u16 temp;
if (!mapChars)
return cifs_strtoUCS(target, source, PATH_MAX, cp);
for (i = 0, j = 0; i < maxlen; j++) {
src_char = source[i];
switch (src_char) {
case 0:
target[j] = 0;
goto ctoUCS_out;
case ':':
target[j] = cpu_to_le16(UNI_COLON);
break;
case '*':
target[j] = cpu_to_le16(UNI_ASTERIK);
break;
case '?':
target[j] = cpu_to_le16(UNI_QUESTION);
break;
case '<':
target[j] = cpu_to_le16(UNI_LESSTHAN);
break;
case '>':
target[j] = cpu_to_le16(UNI_GRTRTHAN);
break;
case '|':
target[j] = cpu_to_le16(UNI_PIPE);
break;
/* BB We can not handle remapping slash until
all the calls to build_path_from_dentry
are modified, as they use slash as separator BB */
/* case '\\':
target[j] = cpu_to_le16(UNI_SLASH);
break;*/
default:
charlen = cp->char2uni(source+i,
len_remaining, &temp);
/* if no match, use question mark, which
at least in some cases servers as wild card */
if (charlen < 1) {
target[j] = cpu_to_le16(0x003f);
charlen = 1;
} else
target[j] = cpu_to_le16(temp);
len_remaining -= charlen;
/* character may take more than one byte in the
the source string, but will take exactly two
bytes in the target string */
i += charlen;
continue;
}
i++; /* move to next char in source string */
len_remaining--;
}
ctoUCS_out:
return i;
}
void
cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
{