If the task has died by the time we call btrfs_uring_read_finished(),
return -ECANCELED rather than trying to copy the pages back to
userspace.
Signed-off-by: Mark Harmstone <maharmstone@xxxxxx>
Suggested-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
(This is quite possibly a resend. I intended this to be the sequel to
"[PATCH 1/2] io_uring/cmd: let cmds to know about dying task", but I
can't find it anywhere on the mailing lists now.)
fs/btrfs/ioctl.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 64cebc32fe76..6913967083fe 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4754,6 +4754,11 @@ static void btrfs_uring_read_finished(struct io_uring_cmd *cmd, unsigned int iss
/* The inode lock has already been acquired in btrfs_uring_read_extent. */
btrfs_lockdep_inode_acquire(inode, i_rwsem);
+ if (unlikely(issue_flags & IO_URING_F_TASK_DEAD)) {
+ ret = -ECANCELED;
+ goto out;
+ }
+
if (priv->err) {
ret = priv->err;
goto out;
--
2.45.2
