io_uring: ensure consistent view of original task ->mm from SQPOLL

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Ensure we get a valid view of the task mm, by using task_lock() when
attempting to grab the original task mm.

Reported-by: syzbot+b57abf7ee60829090495@syzkaller.appspotmail.com
Fixes: 2aede0e417 ("io_uring: stash ctx task reference for SQPOLL")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2020-11-02 10:39:05 -07:00

parent fdaf083cdf

commit 4b70cf9dea

1 changed files with 20 additions and 7 deletions

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fs/io_uring.c

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