io_uring: Fix memory leak in io_sqe_buffers_register()
unreferenced object 0xffff8881123bf0a0 (size 32):
comm "syz-executor557", pid 8384, jiffies
4294946143 (age 12.360s)
backtrace:
[<
ffffffff81469b71>] kmalloc_node include/linux/slab.h:579 [inline]
[<
ffffffff81469b71>] kvmalloc_node+0x61/0xf0 mm/util.c:587
[<
ffffffff815f0b3f>] kvmalloc include/linux/mm.h:795 [inline]
[<
ffffffff815f0b3f>] kvmalloc_array include/linux/mm.h:813 [inline]
[<
ffffffff815f0b3f>] kvcalloc include/linux/mm.h:818 [inline]
[<
ffffffff815f0b3f>] io_rsrc_data_alloc+0x4f/0xc0 fs/io_uring.c:7164
[<
ffffffff815f26d8>] io_sqe_buffers_register+0x98/0x3d0 fs/io_uring.c:8383
[<
ffffffff815f84a7>] __io_uring_register+0xf67/0x18c0 fs/io_uring.c:9986
[<
ffffffff81609222>] __do_sys_io_uring_register fs/io_uring.c:10091 [inline]
[<
ffffffff81609222>] __se_sys_io_uring_register fs/io_uring.c:10071 [inline]
[<
ffffffff81609222>] __x64_sys_io_uring_register+0x112/0x230 fs/io_uring.c:10071
[<
ffffffff842f616a>] do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
[<
ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
Fix data->tags memory leak, through io_rsrc_data_free() to release
data memory space.
Reported-by: syzbot+0f32d05d8b6cd8d7ea3e@syzkaller.appspotmail.com
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Link: https://lore.kernel.org/r/20210430082515.13886-1-qiang.zhang@windriver.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>