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realloc can return NULL in one of two cases - (1) the realloc failed,
(2) realloc succeeded but the new size requested was zero, in which
case this is identical to a free() call.
The error paths dealing with these two cases should be different,
but mostly weren't. Secondly the standard idiom for dealing with
realloc when you know the new size is non-zero is the following :
tmp = realloc(p, size);
if (!tmp) {
SAFE_FREE(p);
return error;
} else {
p = tmp;
}
However, there were *many* *many* places in Samba where we were
using the old (broken) idiom of :
p = realloc(p, size)
if (!p) {
return error;
}
which will leak the memory pointed to by p on realloc fail.
This commit (hopefully) fixes all these cases by moving to
a standard idiom of :
p = SMB_REALLOC(p, size)
if (!p) {
return error;
}
Where if the realloc returns null due to the realloc failing
or size == 0 we *guarentee* that the storage pointed to by p
has been freed. This allows me to remove a lot of code that
was dealing with the standard (more verbose) method that required
a tmp pointer. This is almost always what you want. When a
realloc fails you never usually want the old memory, you
want to free it and get into your error processing asap.
For the 11 remaining cases where we really do need to keep the
old pointer I have invented the new macro SMB_REALLOC_KEEP_OLD_ON_ERROR,
which can be used as follows :
tmp = SMB_REALLOC_KEEP_OLD_ON_ERROR(p, size);
if (!tmp) {
SAFE_FREE(p);
return error;
} else {
p = tmp;
}
SMB_REALLOC_KEEP_OLD_ON_ERROR guarentees never to free the
pointer p, even on size == 0 or realloc fail. All this is
done by a hidden extra argument to Realloc(), BOOL free_old_on_error
which is set appropriately by the SMB_REALLOC and SMB_REALLOC_KEEP_OLD_ON_ERROR
macros (and their array counterparts).
It remains to be seen what this will do to our Coverity bug count :-).
Jeremy.
(This used to be commit 1d710d06a2)
* only keep the registry,tdb file open when we have an open key handle
* tpot's setup.py fix
* removing files that no longer exist in trunk and copying some
that were missing in 3.0
(This used to be commit 6c6bf6ca5f)
* \PIPE\unixinfo
* winbindd's {group,alias}membership new functions
* winbindd's lookupsids() functionality
* swat (trunk changes to be reverted as per discussion with Deryck)
(This used to be commit 939c3cb5d7)
HKLM\\SYSTEM\\CurrentControlSet\\Control\\Termininal Server\\DefaultUserConfiguration
Apparently this started showing up after the winreg-write support
was added in 3.0.20rc1 or so.
Also modifed init_registry_data() to always run and add the
required keys. Initial values however are only written if
they don't already exist.
This makes it easier to add new keys without having to rev the
tdb version number (which is really unnecessary in this case).
Portions of patch reviewed by Thomas Bork on the general samba ml.
(This used to be commit b12a05b237)
the new talloc() features:
Note that the REGSUB_CTR and REGVAL_CTR objects *must* be talloc()'d
since the methods use the object pointer as the talloc context for
internal private data.
There is no longer a regXXX_ctr_intit() and regXXX_ctr_destroy()
pair of functions. Simply TALLOC_ZERO_P() and TALLOC_FREE() the
object.
Also had to convert the printer_info_2->NT_PRINTER_DATA field
to be talloc()'d as well. This is just a stop on the road to
cleaning up the printer memory management.
(This used to be commit ef721333ab)
for NT4 clients enumerating printer data on slow CPUs)
* fix pinter and secdesc record upgrade to normalize the key
(rev'd printer tdb version)
* fixed problem that was normalizing the printername name field
in general, this should fix the issues upgrading print servers
from 3.0.14a to 3.0.20
(This used to be commit d07179de2f)
* more work on the store_values() functions for the Printers key
* add Control\Print\Monitors key to list for reg_db
(This used to be commit 89f17b41ce)
* move to registry.tdb for port listing (at least via the winreg ops)
If no one opposes on the samba list, we'll move to a registry
lookup for enumerating ports rather than the 'enumports command'.
This means that there is a bit of a disconnect between EnumPorts() and
RegEnumKey('hklm\software\microsoft\windows nt\currentversion\ports').
(This used to be commit 6f654c5741)
* make regdb_store_XXX() and regdb_fetch_XXX() functions non-static
* use case sensitive string lookups in reg_dynamic.c since the
keys have already been normalized
* move to new design for making printing related data available
via the winreg pipe (with the intent of allowing writes)
(This used to be commit 28c7293ee9)
printmig.exe assumes that the LUID of the SeBackupPrivlege
on the target server matches the LUID of the privilege
on the local client. Even though an LUID is never guaranteed
to be the same across reboots. How *awful*! My cat could
write better code! (more on my cat later....)
* Set the privelege LUID in the global PRIVS[] array
* Rename RegCreateKey() to RegCreateKeyEx() to better match MSDN
* Rename the unknown field in RegCreateKeyEx() to disposition
(guess according to MSDN)
* Add the capability to define REG_TDB_ONLY for using the reg_db.c
functions and stress the RegXXX() rpc functions.
(This used to be commit 0d6352da48)
to a thin layer in fetch_reg_values(). Not entirely efficient
seeing as the the dynamic value paths are stored in an unsorted
array but it is one strequal() per path. If this was really big
it should be worked into the reghook_cache().
(This used to be commit 63b81ad3cb)
in init_registry_data()
* Add means of storing registry values in registry.tdb
* add builtin_registry_values[] array for REG_DWORD and REG_SZ
values needed during startup
* Finish up RegDeleteValue() and RegSetValue()
* Finish up regdb_store_reg_values() and regdb_fetch_reg_values()
I can now create and retrieve values using regedit.exe on Win2k.
bin/net -S rain -U% rpc registry enumerate 'hklm\software\samba'
Valuename = Version
Type = REG_SZ
Data = 3.0.20
Next is to do the virtual writes in reg_printing.c and I'll be
done with Print Migrator (yeah! finally)
(This used to be commit 3d837e58db)
* start adding write support to the Samba registry
Flesh out the server implementations of
RegCreateKey(), RegSetValue(), RegDeleteKey() and RegDeleteValue()
I can create a new key using regedit.exe now but the 'New Key #1'
key cannot be deleted yet.
(This used to be commit e188fdbef8)
functions so we can funnel through some well known functions. Should help greatly with
malloc checking.
HEAD patch to follow.
Jeremy.
(This used to be commit 620f2e608f)
fix the confusion when we tdb_lock_bystring() but
we retrieve an entry using tdb_fetch_by_string.
It's now always tdb.*bystring()
(This used to be commit 66359531b8)
upper cased already.
However, if you created your registry tdb in the very early versions of jerry's
patch, you could find that usrmgr doesn't function. Simply delete the
registry.tdb, it will be recreated on startup.
Andrew Bartlett
(This used to be commit 17136a88c3)
to check for uppercased strings when we store them not uppercased.
jerry, this fix is needed to make usrmgr.exe work again.
meanwhile we found out that NT_STATUS code may not be appropriate there.
In particular it seem that an NT PDC will send back 02 as error
(ERRbadfile) not 0xc000000f (NT_STATUS_NO_SUCH_FILE NT)
I think further investigation is need to understand which are aprropriate
return codes here.
(This used to be commit 2ad0e81c8d)
* normalize all registry key strings before storing or looking
up paths in the registry tdb
* return the current buffer size for REG_INFO even when not returning
actual data
* fix a segfault report by metze on #samba-technical so that the
user/group object picker works again (was the "ProductType" key
lookup that was failing).
(This used to be commit 5640e6cdb2)
(even nonexistent ones). This gets rid of the Scheduling Agent icon.
* fix NT_STATUS return code for bad registry path (NT_STATUS_NO_SUCH_FILE)
(This used to be commit 915ee5c0ec)
* added REG_OPEN_HKCR for supporting regedit.exe
* All data n a REGISTRY_VALUE is stored to a pointer now
* fixed REG_INFO to correctly display data when double clicking on
and entry in the registry editor
* Will now enumerate installed driver_info_3 data
* fixed numerous bugs related to pointer offsets, memory issues, etc..
in the registry routines
* added a simple caching mechanism to fetch_reg_[keys|values]_specific()
All that is left now is to enumerate PrinterData and I will have finished
what I started out to do....
(This used to be commit 419d7208e8)
registry values are now passed around in containers
(REGSUBKEY_CTR & REGVAL_CTR) which each possess a TALLOC_CTX.
* removed subkey_specific_fn() from REGISTRY_OPS. Is implemented
in the form of a wrapper
* temporarily broke the printing registry ops.
* implemented inheritence for the data_p of nodes in a SORTED_TREE
* All REGISTRY_KEY instances now store a valid REGISTRY_HOOK since
the default REGOSTRY_OPS structure is stored in the root of the
cache_tree.
* Probably some other change I forgot.... T
(This used to be commit e7b55e8f01)
