| Message ID | 20150623105445.GA6746@udknight.ahead-top.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/fs/super.c b/fs/super.c index 928c20f..b613723 100644 --- a/fs/super.c +++ b/fs/super.c @@ -842,7 +842,7 @@ int get_anon_bdev(dev_t *p) else if (error) return -EAGAIN; - if (dev == (1 << MINORBITS)) { + if (dev >= (1 << MINORBITS)) { spin_lock(&unnamed_dev_lock); ida_remove(&unnamed_dev_ida, dev); if (unnamed_dev_start > dev)
Execution of get_anon_bdev concurrently and preemptive kernel all could bring race condition, it isn't enough to check dev against its upper limitation with equality operator only. This patch fix it. Signed-off-by: Wang YanQing <udknight@gmail.com> --- fs/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)