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authorSasha Levin <levinsasha928@gmail.com>2012-05-10 13:01:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-10 15:06:44 -0700
commit93278814d3590eba0ee360b8d69a35c7f2203ea8 (patch)
tree17784192015e71464f1064af2b071c8cd7fe7f13 /mm/page_alloc.c
parent16fbdce62d9c89b794e303f4a232e4749b77e9ac (diff)
downloadop-kernel-dev-93278814d3590eba0ee360b8d69a35c7f2203ea8.zip
op-kernel-dev-93278814d3590eba0ee360b8d69a35c7f2203ea8.tar.gz
mm: fix division by 0 in percpu_pagelist_fraction()
percpu_pagelist_fraction_sysctl_handler() has only considered -EINVAL as a possible error from proc_dointvec_minmax(). If any other error is returned, it would proceed to divide by zero since percpu_pagelist_fraction wasn't getting initialized at any point. For example, writing 0 bytes into the proc file would trigger the issue. Signed-off-by: Sasha Levin <levinsasha928@gmail.com> Reviewed-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a712fb9..b21b3db 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -105,7 +105,7 @@ unsigned long totalreserve_pages __read_mostly;
*/
unsigned long dirty_balance_reserve __read_mostly;
-int percpu_pagelist_fraction;
+int percpu_pagelist_fraction = 8;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
#ifdef CONFIG_PM_SLEEP
@@ -5203,7 +5203,7 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
int ret;
ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
- if (!write || (ret == -EINVAL))
+ if (!write || (ret < 0))
return ret;
for_each_populated_zone(zone) {
for_each_possible_cpu(cpu) {
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