This is a note to let you know that I've just added the patch titled
io-wq: Fix memory leak in worker creation
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io-wq-fix-memory-leak-in-worker-creation.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 996d3efeb091c503afd3ee6b5e20eabf446fd955 Mon Sep 17 00:00:00 2001
From: Rafael Mendonca <rafaelmendsr@xxxxxxxxx>
Date: Wed, 19 Oct 2022 22:47:09 -0300
Subject: io-wq: Fix memory leak in worker creation
From: Rafael Mendonca <rafaelmendsr@xxxxxxxxx>
commit 996d3efeb091c503afd3ee6b5e20eabf446fd955 upstream.
If the CPU mask allocation for a node fails, then the memory allocated for
the 'io_wqe' struct of the current node doesn't get freed on the error
handling path, since it has not yet been added to the 'wqes' array.
This was spotted when fuzzing v6.1-rc1 with Syzkaller:
BUG: memory leak
unreferenced object 0xffff8880093d5000 (size 1024):
comm "syz-executor.2", pid 7701, jiffies 4295048595 (age 13.900s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000cb463369>] __kmem_cache_alloc_node+0x18e/0x720
[<00000000147a3f9c>] kmalloc_node_trace+0x2a/0x130
[<000000004e107011>] io_wq_create+0x7b9/0xdc0
[<00000000c38b2018>] io_uring_alloc_task_context+0x31e/0x59d
[<00000000867399da>] __io_uring_add_tctx_node.cold+0x19/0x1ba
[<000000007e0e7a79>] io_uring_setup.cold+0x1b80/0x1dce
[<00000000b545e9f6>] __x64_sys_io_uring_setup+0x5d/0x80
[<000000008a8a7508>] do_syscall_64+0x5d/0x90
[<000000004ac08bec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Fixes: 0e03496d1967 ("io-wq: use private CPU mask")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Rafael Mendonca <rafaelmendsr@xxxxxxxxx>
Link: https://lore.kernel.org/r/20221020014710.902201-1-rafaelmendsr@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/io-wq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -1152,10 +1152,10 @@ struct io_wq *io_wq_create(unsigned boun
wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node);
if (!wqe)
goto err;
+ wq->wqes[node] = wqe;
if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL))
goto err;
cpumask_copy(wqe->cpu_mask, cpumask_of_node(node));
- wq->wqes[node] = wqe;
wqe->node = alloc_node;
wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
Patches currently in stable-queue which might be from rafaelmendsr@xxxxxxxxx are
queue-5.15/drm-vmwgfx-fix-memory-leak-in-vmw_mksstat_add_ioctl.patch
queue-5.15/xhci-dbc-fix-memory-leak-in-xhci_alloc_dbc.patch
queue-5.15/drm-amdgpu-fix-memory-leak-in-hpd_rx_irq_create_work.patch
queue-5.15/io-wq-fix-memory-leak-in-worker-creation.patch
