Hello,
This patch fixes NULL pointer dereference in print_daily_error_info, when
called
on unmounted fs (EXT4_SB(sb) returns NULL). Deleting error reporting timer
in
ext4_put_super fixes oops.
IRQ:
run_timer_softirq
?run_timer_softirq
print_daily_error_info
?__do_softirq
__do_softirq
call_softirq
do_softirq
irq_exit
smp_apic_timer_interrupt
apic_timer_interrupt
EOI
intel_idle
intel_idle
...
By the way, isn't print_daily_error_info racy? Is it safe to call
print_daily_error_info
(by timer event (softirq)) when we'are remounting fs, etc.?
Please kindly review.
---
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2614774..751997d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -719,6 +719,7 @@ static void ext4_put_super(struct super_block *sb)
ext4_abort(sb, "Couldn't clean up the journal");
}
+ del_timer(&sbi->s_err_report);
ext4_release_system_zone(sb);
ext4_mb_release(sb);
ext4_ext_release(sb);
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