[PATCH 1/4] aio: hold an extra file reference over AIO read/write operations

[Christoph Hellwig]

Otherwise we might dereference an already freed file and/or inode
when aio_complete is called before we return from the read_iter or
write_iter method.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/aio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/aio.c b/fs/aio.c
index 1157e13..0aa71d3 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1460,6 +1460,7 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
 			return ret;
 		}
 
+		get_file(file);
 		if (rw == WRITE)
 			file_start_write(file);
 
@@ -1467,6 +1468,7 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
 
 		if (rw == WRITE)
 			file_end_write(file);
+		fput(file);
 		kfree(iovec);
 		break;
 
-- 
2.1.4