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c6d3d9cbd6
[ 27.259845] general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
[ 27.261043] KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
[ 27.263730] RIP: 0010:sock_from_file+0x20/0x90
[ 27.272444] Call Trace:
[ 27.272736] io_sendmsg+0x98/0x600
[ 27.279216] io_issue_sqe+0x498/0x68d0
[ 27.281142] __io_queue_sqe+0xab/0xb50
[ 27.285830] io_req_task_submit+0xbf/0x1b0
[ 27.286306] tctx_task_work+0x178/0xad0
[ 27.288211] task_work_run+0xe2/0x190
[ 27.288571] exit_to_user_mode_prepare+0x1a1/0x1b0
[ 27.289041] syscall_exit_to_user_mode+0x19/0x50
[ 27.289521] do_syscall_64+0x48/0x90
[ 27.289871] entry_SYSCALL_64_after_hwframe+0x44/0xae
io_req_complete_failed() -> io_req_complete_post() ->
io_req_task_queue() still would try to enqueue hard linked request,
which can be half prepared (e.g. failed init), so we can't allow
that to happen.
Fixes: a8295b982c ("io_uring: fix failed linkchain code logic")
Reported-by: syzbot+f9704d1878e290eddf73@syzkaller.appspotmail.com
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/70b513848c1000f88bd75965504649c6bb1415c0.1630415423.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.