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cifs: clean up unaligned accesses in cifs_unicode.c 

Make sure we use get/put_unaligned routines when accessing wide
character strings.

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
parent 26ec254869
commit ba2dbf30df
1 changed files with 28 additions and 23 deletions
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51
fs/cifs/cifs_unicode.c
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@ -44,10 +44,14 @@ cifs_ucs2_bytes(const __le16 *from, int maxbytes,
int charlen, outlen = 0;
int maxwords = maxbytes / 2;
char tmp[NLS_MAX_CHARSET_SIZE];
__u16 ftmp;
for (i = 0; i < maxwords && from[i]; i++) {
charlen = codepage->uni2char(le16_to_cpu(from[i]), tmp,
NLS_MAX_CHARSET_SIZE);
for (i = 0; i < maxwords; i++) {
ftmp = get_unaligned_le16(&from[i]);
if (ftmp == 0)
break;
charlen = codepage->uni2char(ftmp, tmp, NLS_MAX_CHARSET_SIZE);
if (charlen > 0)
outlen += charlen;
else
@ -58,9 +62,9 @@ cifs_ucs2_bytes(const __le16 *from, int maxbytes,
}
/*
* cifs_mapchar - convert a little-endian char to proper char in codepage
* cifs_mapchar - convert a host-endian char to proper char in codepage
* @target - where converted character should be copied
* @src_char - 2 byte little-endian source character
* @src_char - 2 byte host-endian source character
* @cp - codepage to which character should be converted
* @mapchar - should character be mapped according to mapchars mount option?
*
@ -69,7 +73,7 @@ cifs_ucs2_bytes(const __le16 *from, int maxbytes,
* enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE).
*/
static int
cifs_mapchar(char *target, const __le16 src_char, const struct nls_table *cp,
cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp,
bool mapchar)
{
int len = 1;
@ -82,7 +86,7 @@ cifs_mapchar(char *target, const __le16 src_char, const struct nls_table *cp,
* build_path_from_dentry are modified, as they use slash as
* separator.
*/
switch (le16_to_cpu(src_char)) {
switch (src_char) {
case UNI_COLON:
*target = ':';
break;
@ -109,8 +113,7 @@ cifs_mapchar(char *target, const __le16 src_char, const struct nls_table *cp,
return len;
cp_convert:
len = cp->uni2char(le16_to_cpu(src_char), target,
NLS_MAX_CHARSET_SIZE);
len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE);
if (len <= 0) {
*target = '?';
len = 1;
@ -149,6 +152,7 @@ cifs_from_ucs2(char *to, const __le16 *from, int tolen, int fromlen,
int nullsize = nls_nullsize(codepage);
int fromwords = fromlen / 2;
char tmp[NLS_MAX_CHARSET_SIZE];
__u16 ftmp;
/*
* because the chars can be of varying widths, we need to take care
@ -158,19 +162,23 @@ cifs_from_ucs2(char *to, const __le16 *from, int tolen, int fromlen,
*/
safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize);
for (i = 0; i < fromwords && from[i]; i++) {
for (i = 0; i < fromwords; i++) {
ftmp = get_unaligned_le16(&from[i]);
if (ftmp == 0)
break;
/*
* check to see if converting this character might make the
* conversion bleed into the null terminator
*/
if (outlen >= safelen) {
charlen = cifs_mapchar(tmp, from[i], codepage, mapchar);
charlen = cifs_mapchar(tmp, ftmp, codepage, mapchar);
if ((outlen + charlen) > (tolen - nullsize))
break;
}
/* put converted char into 'to' buffer */
charlen = cifs_mapchar(&to[outlen], from[i], codepage, mapchar);
charlen = cifs_mapchar(&to[outlen], ftmp, codepage, mapchar);
outlen += charlen;
}
@ -193,24 +201,21 @@ cifs_strtoUCS(__le16 *to, const char *from, int len,
{
int charlen;
int i;
wchar_t *wchar_to = (wchar_t *)to; /* needed to quiet sparse */
wchar_t wchar_to; /* needed to quiet sparse */
for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
/* works for 2.4.0 kernel or later */
charlen = codepage->char2uni(from, len, &wchar_to[i]);
charlen = codepage->char2uni(from, len, &wchar_to);
if (charlen < 1) {
cERROR(1, "strtoUCS: char2uni of %d returned %d",
(int)*from, charlen);
cERROR(1, "strtoUCS: char2uni of 0x%x returned %d",
*from, charlen);
/* A question mark */
to[i] = cpu_to_le16(0x003f);
wchar_to = 0x003f;
charlen = 1;
} else
to[i] = cpu_to_le16(wchar_to[i]);
}
put_unaligned_le16(wchar_to, &to[i]);
}
to[i] = 0;
put_unaligned_le16(0, &to[i]);
return i;
}