Re: [PATCH for-next] RDMA/rxe: check rxe_pd before rxe_put in rxe_mr_cleanup()

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On 06/07/2022 17:21, Li, Zhijian wrote:
> It's possible mr_pd(mr) returns NULL if rxe_mr_alloc() fails.
>
> it fixes below panic:
> [  114.163945] RPC: Registered rdma backchannel transport module.
> [  116.868003] eth0 speed is unknown, defaulting to 1000
> [  120.173114] rdma_rxe: rxe_mr_init_user: Unable to allocate memory for map
> [  120.173159] ==================================================================
> [  120.173161] BUG: KASAN: null-ptr-deref in __rxe_put+0x18/0x60 [rdma_rxe]
> [  120.173194] Write of size 4 at addr 0000000000000080 by task rdma_flush_serv/685
> [  120.173197]
> [  120.173199] CPU: 0 PID: 685 Comm: rdma_flush_serv Not tainted 5.19.0-rc1-roce-flush+ #90
> [  120.173203] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-27-g64f37cc530f1-prebuilt.qemu.org 04/01/2014
> [  120.173208] Call Trace:
> [  120.173216]  <TASK>
> [  120.173217]  dump_stack_lvl+0x34/0x44
> [  120.173250]  kasan_report+0xab/0x120
> [  120.173261]  ? __rxe_put+0x18/0x60 [rdma_rxe]
> [  120.173277]  kasan_check_range+0xf9/0x1e0
> [  120.173282]  __rxe_put+0x18/0x60 [rdma_rxe]
> [  120.173311]  rxe_mr_cleanup+0x21/0x140 [rdma_rxe]
> [  120.173328]  __rxe_cleanup+0xff/0x1d0 [rdma_rxe]
> [  120.173344]  rxe_reg_user_mr+0xa7/0xc0 [rdma_rxe]
> [  120.173360]  ib_uverbs_reg_mr+0x265/0x460 [ib_uverbs]
> [  120.173387]  ? ib_uverbs_modify_qp+0x8b/0xd0 [ib_uverbs]
> [  120.173433]  ? ib_uverbs_create_cq+0x100/0x100 [ib_uverbs]
> [  120.173461]  ? uverbs_fill_udata+0x1d8/0x330 [ib_uverbs]
> [  120.173488]  ib_uverbs_handler_UVERBS_METHOD_INVOKE_WRITE+0x19d/0x250 [ib_uverbs]
> [  120.173517]  ? ib_uverbs_handler_UVERBS_METHOD_QUERY_CONTEXT+0x190/0x190 [ib_uverbs]
> [  120.173547]  ? radix_tree_next_chunk+0x31e/0x410
> [  120.173559]  ? uverbs_fill_udata+0x255/0x330 [ib_uverbs]
> [  120.173587]  ib_uverbs_cmd_verbs+0x11c2/0x1450 [ib_uverbs]
> [  120.173616]  ? ucma_put_ctx+0x16/0x50 [rdma_ucm]
> [  120.173623]  ? __rcu_read_unlock+0x43/0x60
> [  120.173633]  ? ib_uverbs_handler_UVERBS_METHOD_QUERY_CONTEXT+0x190/0x190 [ib_uverbs]
> [  120.173661]  ? uverbs_fill_udata+0x330/0x330 [ib_uverbs]
> [  120.173711]  ? avc_ss_reset+0xb0/0xb0
> [  120.173722]  ? vfs_fileattr_set+0x450/0x450
> [  120.173742]  ? should_fail+0x78/0x2b0
> [  120.173745]  ? __fsnotify_parent+0x38a/0x4e0
> [  120.173764]  ? ioctl_has_perm.constprop.0.isra.0+0x198/0x210
> [  120.173784]  ? should_fail+0x78/0x2b0
> [  120.173787]  ? selinux_bprm_creds_for_exec+0x550/0x550
> [  120.173792]  ib_uverbs_ioctl+0x114/0x1b0 [ib_uverbs]
> [  120.173820]  ? ib_uverbs_cmd_verbs+0x1450/0x1450 [ib_uverbs]
> [  120.173861]  __x64_sys_ioctl+0xb4/0xf0
> [  120.173867]  do_syscall_64+0x3b/0x90
> [  120.173877]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
> [  120.173884] RIP: 0033:0x7f4b563c14eb
> [  120.173889] Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 55 b9 0c 00 f7 d8 64 89 01 48
> [  120.173892] RSP: 002b:00007ffe0e4a6fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
>
> Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
Add Fixes tag:

Fixes: cf40367961d8 ("RDMA/rxe: Move mr cleanup code to rxe_mr_cleanup()")


> ---
>   drivers/infiniband/sw/rxe/rxe_mr.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
> index 9a5c2af6a56f..cec5775a72f2 100644
> --- a/drivers/infiniband/sw/rxe/rxe_mr.c
> +++ b/drivers/infiniband/sw/rxe/rxe_mr.c
> @@ -695,8 +695,10 @@ int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
>   void rxe_mr_cleanup(struct rxe_pool_elem *elem)
>   {
>   	struct rxe_mr *mr = container_of(elem, typeof(*mr), elem);
> +	struct rxe_pd *pd = mr_pd(mr);
>   
> -	rxe_put(mr_pd(mr));
> +	if (pd)
> +		rxe_put(pd);
>   
>   	ib_umem_release(mr->umem);
>   




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