CVE-2021-47292

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> io_uring: fix memleak in io_init_wq_offload()<br /> <br /> I got memory leak report when doing fuzz test:<br /> <br /> BUG: memory leak<br /> unreferenced object 0xffff888107310a80 (size 96):<br /> comm "syz-executor.6", pid 4610, jiffies 4295140240 (age 20.135s)<br /> hex dump (first 32 bytes):<br /> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................<br /> 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........<br /> backtrace:<br /> [] kmalloc include/linux/slab.h:591 [inline]<br /> [] kzalloc include/linux/slab.h:721 [inline]<br /> [] io_init_wq_offload fs/io_uring.c:7920 [inline]<br /> [] io_uring_alloc_task_context+0x466/0x640 fs/io_uring.c:7955<br /> [] __io_uring_add_tctx_node+0x256/0x360 fs/io_uring.c:9016<br /> [] io_uring_add_tctx_node fs/io_uring.c:9052 [inline]<br /> [] __do_sys_io_uring_enter fs/io_uring.c:9354 [inline]<br /> [] __se_sys_io_uring_enter fs/io_uring.c:9301 [inline]<br /> [] __x64_sys_io_uring_enter+0xabc/0xc20 fs/io_uring.c:9301<br /> [] do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> [] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80<br /> [] entry_SYSCALL_64_after_hwframe+0x44/0xae<br /> <br /> CPU0 CPU1<br /> io_uring_enter io_uring_enter<br /> io_uring_add_tctx_node io_uring_add_tctx_node<br /> __io_uring_add_tctx_node __io_uring_add_tctx_node<br /> io_uring_alloc_task_context io_uring_alloc_task_context<br /> io_init_wq_offload io_init_wq_offload<br /> hash = kzalloc hash = kzalloc<br /> ctx-&gt;hash_map = hash ctx-&gt;hash_map = hash