diff options
author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-01-18 07:05:47 -0500 |
---|---|---|
committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-05-13 00:22:30 -0400 |
commit | e94c1ea78329ed8c521d805d35edbeaceaee6317 (patch) | |
tree | 83bc89d78a8f88c0aac6fb233b078421140a8c8e | |
parent | 15107597629382f11c087bb0260a547e3fb47c9c (diff) |
fs/aio: Use kmap_local() instead of kmap()
Originally, we used kmap() instead of kmap_atomic() for reading events
out of the completion ringbuffer because we're using copy_to_user(),
which can fault.
Now that kmap_local() is a thing, use that instead.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Benjamin LaHaise <bcrl@kvack.org
Cc: linux-aio@kvack.org
Cc: linux-fsdevel@vger.kernel.org
-rw-r--r-- | fs/aio.c | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -1250,10 +1250,10 @@ static long aio_read_events_ring(struct kioctx *ctx, avail = min(avail, nr - ret); avail = min_t(long, avail, AIO_EVENTS_PER_PAGE - pos); - ev = kmap(page); + ev = kmap_local_page(page); copy_ret = copy_to_user(event + ret, ev + pos, sizeof(*ev) * avail); - kunmap(page); + kunmap_local(ev); if (unlikely(copy_ret)) { ret = -EFAULT; |