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authorJens Axboe <axboe@kernel.dk>2021-07-22 17:08:07 -0600
committerJens Axboe <axboe@kernel.dk>2021-07-22 17:11:46 -0600
commit0cc936f74bcacb039b7533aeac0a887dfc896bf6 (patch)
tree16f36180e934e00fe2f5b34f37efadb21f8e2b53 /fs
parent362a9e65289284f36403058eea2462d0330c1f24 (diff)
io_uring: fix early fdput() of file
A previous commit shuffled some code around, and inadvertently used struct file after fdput() had been called on it. As we can't touch the file post fdput() dropping our reference, move the fdput() to after that has been done. Cc: Pavel Begunkov <asml.silence@gmail.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/io-uring/YPnqM0fY3nM5RdRI@zeniv-ca.linux.org.uk/ Fixes: f2a48dd09b8e ("io_uring: refactor io_sq_offload_create()") Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
-rw-r--r--fs/io_uring.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index fe3d948658ad..f2fe4eca150b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7991,9 +7991,11 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
f = fdget(p->wq_fd);
if (!f.file)
return -ENXIO;
- fdput(f);
- if (f.file->f_op != &io_uring_fops)
+ if (f.file->f_op != &io_uring_fops) {
+ fdput(f);
return -EINVAL;
+ }
+ fdput(f);
}
if (ctx->flags & IORING_SETUP_SQPOLL) {
struct task_struct *tsk;