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[CIFS] when mount helper missing fix slash wrong direction in share

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Kernel bugzilla bug #9228

If mount helper (mount.cifs) missing, mounts with form like
//10.11.12.13/c$ would not work (only mounts with slash e.g.
//10.11.12.13\\c$ would work) due to problem with slash supposed
to be converted to backslash by the mount helper (which is not
there).

If we fail on converting an IPv4 address in in4_pton then
try to canonicalize the first slash (ie between sharename
and host ip address) if necessary.  If we have to retry
to check for IPv6 address the slash is already converted
if necessary.

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2007-11-01 02:12:10 +00:00
parent 953f868138
commit 1fb64bfc45
2 changed files with 39 additions and 6 deletions
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5
fs/cifs/CHANGES
View File

@ -14,7 +14,10 @@ bigendian architectures. Fix possible memory corruption when
EAGAIN returned on kern_recvmsg. Return better error if server
requires packet signing but client has disabled it. When mounted
with cifsacl mount option - mode bits are approximated based
on the contents of the files ACL.
on the contents of the ACL of the file or directory. When cifs
mount helper is missing convert make sure that UNC name
has backslash (not forward slash) between ip address of server
and the share name.
Version 1.50
------------

40
fs/cifs/netmisc.c
View File

@ -132,6 +132,34 @@ static const struct smb_to_posix_error mapping_table_ERRHRD[] = {
{0, 0}
};
/* if the mount helper is missing we need to reverse the 1st slash
from '/' to backslash in order to format the UNC properly for
ip address parsing and for tree connect (unless the user
remembered to put the UNC name in properly). Fortunately we do
not have to call this twice (we check for IPv4 addresses
first, so it is already converted by the time we
try IPv6 addresses */
static int canonicalize_unc(char *cp)
{
int i;
for (i = 0; i <= 46 /* INET6_ADDRSTRLEN */ ; i++) {
if (cp[i] == 0)
break;
if (cp[i] == '\\')
break;
if (cp[i] == '/') {
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("change slash to backslash in malformed UNC"));
#endif
cp[i] = '\\';
return 1;
}
}
return 0;
}
/* Convert string containing dotted ip address to binary form */
/* returns 0 if invalid address */
@ -141,11 +169,13 @@ cifs_inet_pton(int address_family, char *cp, void *dst)
int ret = 0;
/* calculate length by finding first slash or NULL */
/* BB Should we convert '/' slash to '\' here since it seems already
* done before this */
if ( address_family == AF_INET ) {
ret = in4_pton(cp, -1 /* len */, dst , '\\', NULL);
} else if ( address_family == AF_INET6 ) {
if (address_family == AF_INET) {
ret = in4_pton(cp, -1 /* len */, dst, '\\', NULL);
if (ret == 0) {
if (canonicalize_unc(cp))
ret = in4_pton(cp, -1, dst, '\\', NULL);
}
} else if (address_family == AF_INET6) {
ret = in6_pton(cp, -1 /* len */, dst , '\\', NULL);
}
#ifdef CONFIG_CIFS_DEBUG2