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SubjectRe: [2.4] Multiple memleaks in IBM Hot Plug Controller Driver
Hello!

On Thu, Mar 13, 2003 at 04:31:44PM -0800, Greg KH wrote:
> > There seem to be memleak convert_2digits_to_char() function that is triggered
> > during normal operations.
> > Also I think there are some memleaks on error exit paths
> > ebda_rsrc_controller()
> > All of this is addressed by below patch.
> > 2.5 seems to have totally different version of this code (and no
> > convert_2digits_to_char() function at all for example).
> Yes, the 2.5 version should be backported to 2.4. There have been a
> number of error patch fixes in the 2.5 version, care to make up a patch?

Ok, see below.
Note there is no credit for me. Your 2 patches from 2.5 applied to 2.4
just fine even without offsets, and stuff compiled (I have no hardware to test
how it works, but I presume it will work ok).
Comments for patches were:
C IBM PCI Hotplug driver: Clean up the slot filename generation logic a lot.
C IBM PCI Hotplug: fix a load of memory leak errors found by the checker project
.

Bye,
Oleg
===== drivers/hotplug/ibmphp_ebda.c 1.7 vs 1.8 =====
--- 1.7/drivers/hotplug/ibmphp_ebda.c Sat Nov 23 05:00:44 2002
+++ 1.8/drivers/hotplug/ibmphp_ebda.c Wed Feb 5 19:56:25 2003
@@ -65,8 +65,6 @@
static LIST_HEAD (opt_lo_head);
static void *io_mem;

-char *chassis_str, *rxe_str, *str;
-
/* Local functions */
static int ebda_rsrc_controller (void);
static int ebda_rsrc_rsrc (void);
@@ -591,32 +589,6 @@
return 0;
}

-static char *convert_2digits_to_char (int var)
-{
- int bit;
- char *str1;
-
- str = (char *) kmalloc (3, GFP_KERNEL);
- memset (str, 0, 3);
- str1 = (char *) kmalloc (2, GFP_KERNEL);
- memset (str, 0, 3);
- bit = (int)(var / 10);
- switch (bit) {
- case 0:
- //one digit number
- *str = (char)(var + 48);
- return str;
- default:
- //2 digits number
- *str1 = (char)(bit + 48);
- strncpy (str, str1, 1);
- memset (str1, 0, 3);
- *str1 = (char)((var % 10) + 48);
- strcat (str, str1);
- return str;
- }
- return NULL;
-}

/* Since we don't know the max slot number per each chassis, hence go
* through the list of all chassis to find out the range
@@ -701,7 +673,7 @@
{
struct opt_rio *opt_vg_ptr = NULL;
struct opt_rio_lo *opt_lo_ptr = NULL;
- char *ptr_chassis_num, *ptr_rxe_num, *ptr_slot_num;
+ static char str[30];
int which = 0; /* rxe = 1, chassis = 0 */
u8 number = 1; /* either chassis or rxe # */
u8 first_slot = 1;
@@ -715,19 +687,7 @@

slot_num = slot_cur->number;

- chassis_str = (char *) kmalloc (30, GFP_KERNEL);
- memset (chassis_str, 0, 30);
- rxe_str = (char *) kmalloc (30, GFP_KERNEL);
- memset (rxe_str, 0, 30);
- ptr_chassis_num = (char *) kmalloc (3, GFP_KERNEL);
- memset (ptr_chassis_num, 0, 3);
- ptr_rxe_num = (char *) kmalloc (3, GFP_KERNEL);
- memset (ptr_rxe_num, 0, 3);
- ptr_slot_num = (char *) kmalloc (3, GFP_KERNEL);
- memset (ptr_slot_num, 0, 3);
-
- strcpy (chassis_str, "chassis");
- strcpy (rxe_str, "rxe");
+ memset (str, 0, sizeof(str));

if (rio_table_ptr) {
if (rio_table_ptr->ver_num == 3) {
@@ -772,31 +732,10 @@
}
}

- switch (which) {
- case 0:
- /* Chassis */
- *ptr_chassis_num = (char)(number + 48);
- strcat (chassis_str, ptr_chassis_num);
- kfree (ptr_chassis_num);
- strcat (chassis_str, "slot");
- ptr_slot_num = convert_2digits_to_char (slot_num - first_slot + 1);
- strcat (chassis_str, ptr_slot_num);
- kfree (ptr_slot_num);
- return chassis_str;
- break;
- case 1:
- /* RXE */
- *ptr_rxe_num = (char)(number + 48);
- strcat (rxe_str, ptr_rxe_num);
- kfree (ptr_rxe_num);
- strcat (rxe_str, "slot");
- ptr_slot_num = convert_2digits_to_char (slot_num - first_slot + 1);
- strcat (rxe_str, ptr_slot_num);
- kfree (ptr_slot_num);
- return rxe_str;
- break;
- }
- return NULL;
+ sprintf(str, "%s%dslot%d",
+ which == 0 ? "chassis" : "rxe",
+ number, slot_num - first_slot + 1);
+ return str;
}

static struct pci_driver ibmphp_driver;
@@ -1060,10 +999,6 @@
slot_cur = list_entry (list, struct slot, ibm_slot_list);

snprintf (slot_cur->hotplug_slot->name, 30, "%s", create_file_name (slot_cur));
- if (chassis_str)
- kfree (chassis_str);
- if (rxe_str)
- kfree (rxe_str);
pci_hp_register (slot_cur->hotplug_slot);
}

-
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