From 602586a83b719df0fbd94196a1359ed35aeb2df3 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Tue, 17 Aug 2010 15:23:56 -0700 Subject: [PATCH] shmem: put_super must percpu_counter_destroy list_add() corruption messages reported from shmem_fill_super()'s recently introduced percpu_counter_init(): shmem_put_super() needs to remember to percpu_counter_destroy(). And also check error from percpu_counter_init(). Reported-bisected-and-tested-by: Tetsuo Handa Signed-off-by: Hugh Dickins Signed-off-by: Linus Torvalds --- mm/shmem.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index dfaa0f4e978..080b09a57a8 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2325,7 +2325,10 @@ static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs) static void shmem_put_super(struct super_block *sb) { - kfree(sb->s_fs_info); + struct shmem_sb_info *sbinfo = SHMEM_SB(sb); + + percpu_counter_destroy(&sbinfo->used_blocks); + kfree(sbinfo); sb->s_fs_info = NULL; } @@ -2367,7 +2370,8 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent) #endif spin_lock_init(&sbinfo->stat_lock); - percpu_counter_init(&sbinfo->used_blocks, 0); + if (percpu_counter_init(&sbinfo->used_blocks, 0)) + goto failed; sbinfo->free_inodes = sbinfo->max_inodes; sb->s_maxbytes = SHMEM_MAX_BYTES; -- 2.20.1