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powerpc/cell/OProfile: Fix on-stack array size in activate spu profiling function 

The size of the pm_signal_local array should be equal to the
number of SPUs being configured in the array.  Currently, the
array is of size 4 (NR_PHYS_CTRS) but being indexed by a for
loop from 0 to 7 (NUM_SPUS_PER_NODE).  This could potentially
cause an oops or random memory corruption since the pm_signal_local
array is on the stack.  This fixes it.

Signed-off-by: Carl Love <carll@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Carl Love 2008-10-29 05:06:45 +00:00 committed by Paul Mackerras
parent 3c10c9c45e
commit 210434d763
1 changed files with 10 additions and 3 deletions
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13
arch/powerpc/oprofile/op_model_cell.c
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@ -582,6 +582,13 @@ static int cell_reg_setup(struct op_counter_config *ctr,
num_counters = num_ctrs;
if (unlikely(num_ctrs > NR_PHYS_CTRS)) {
printk(KERN_ERR
"%s: Oprofile, number of specified events " \
"exceeds number of physical counters\n",
__func__);
return -EIO;
}
pm_regs.group_control = 0;
pm_regs.debug_bus_control = 0;
@ -830,13 +837,13 @@ static int calculate_lfsr(int n)
static int pm_rtas_activate_spu_profiling(u32 node)
{
int ret, i;
struct pm_signal pm_signal_local[NR_PHYS_CTRS];
struct pm_signal pm_signal_local[NUM_SPUS_PER_NODE];
/*
* Set up the rtas call to configure the debug bus to
* route the SPU PCs. Setup the pm_signal for each SPU
*/
for (i = 0; i < NUM_SPUS_PER_NODE; i++) {
for (i = 0; i < ARRAY_SIZE(pm_signal_local); i++) {
pm_signal_local[i].cpu = node;
pm_signal_local[i].signal_group = 41;
/* spu i on word (i/2) */
@ -848,7 +855,7 @@ static int pm_rtas_activate_spu_profiling(u32 node)
ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE,
PASSTHRU_ENABLE, pm_signal_local,
(NUM_SPUS_PER_NODE
(ARRAY_SIZE(pm_signal_local)
* sizeof(struct pm_signal)));
if (unlikely(ret)) {