Check to prevent unsigned wrap of size before subtraction.
Signed-off-by: Roel Kluin <roel.kl...@gmail.com>
---
Is this maybe better or are we certain that size can't wrap?
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 1ade7eb..dd2d263 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -287,7 +287,7 @@ static int __init htab_dt_scan_page_sizes(unsigned long
node,
DBG("Page sizes from device-tree:\n");
size /= 4;
cur_cpu_spec->cpu_features &= ~(CPU_FTR_16M_PAGE);
- while(size > 0) {
+ while(size >= 3) {
unsigned int shift = prop[0];
unsigned int slbenc = prop[1];
unsigned int lpnum = prop[2];
@@ -296,7 +296,7 @@ static int __init htab_dt_scan_page_sizes(unsigned long
node,
int idx = -1;
size -= 3; prop += 3;
- while(size > 0 && lpnum) {
+ while(size >= 2 && lpnum) {
if (prop[0] == shift)
lpenc = prop[1];
prop += 2; size -= 2;
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