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>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a712fb9..b21b3db 100644 (file)
--- 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) {