io_uring: fix possible deadlock in io_register_iowq_max_workers()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix possible deadlock in io_register_iowq_max_workers() The io_register_iowq_max_workers() function calls io_put_sq_data(), which acquires the sqd->lock without releasing the uring_lock. Similar to the commit 009ad9f0c6ee ("io_uring: drop ctx->uring_lock before acquiring sqd->lock"), this can lead to a potential deadlock situation. To resolve this issue, the uring_lock is released before calling io_put_sq_data(), and then it is re-acquired after the function call. This change ensures that the locks are acquired in the correct order, preventing the possibility of a deadlock.

References

• https://git.kernel.org/stable/c/b17397a0a5c56e111f61cb5b77d162664dc00de9
• https://git.kernel.org/stable/c/97ed7ff58de66c544692b3c2b988f3f594348de0
• https://git.kernel.org/stable/c/fdacd09f2ddf7a00787291f08ee48c0421e5b709
• https://git.kernel.org/stable/c/950ac86cff338ab56e2eaf611f4936ee34893b63
• https://git.kernel.org/stable/c/b571a367502c7ef94c688ef9c7f7d69a2ce3bcca
• https://git.kernel.org/stable/c/73254a297c2dd094abec7c9efee32455ae875bdf