CVE-2023-53110

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups.

This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create().

		smc_smcr_terminate_all

smc_buf_create /* init */ conn->sndbuf_desc = NULL; ...

		__smc_lgr_terminate
			smc_conn_kill
				smc_close_abort
					smc_cdc_get_slot_and_msg_send

		__softirqentry_text_start
			smc_wr_tx_process_cqe
				smc_cdc_tx_handler
					READ(conn->sndbuf_desc->len);
					/* panic dues to NULL sndbuf_desc */

conn->sndbuf_desc = xxx;

This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups.

This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create().

		smc_smcr_terminate_all

smc_buf_create /* init */ conn->sndbuf_desc = NULL; ...

		__smc_lgr_terminate
			smc_conn_kill
				smc_close_abort
					smc_cdc_get_slot_and_msg_send

		__softirqentry_text_start
			smc_wr_tx_process_cqe
				smc_cdc_tx_handler
					READ(conn->sndbuf_desc->len);
					/* panic dues to NULL sndbuf_desc */

conn->sndbuf_desc = xxx;

This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups.

This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create().

		smc_smcr_terminate_all

smc_buf_create /* init */ conn->sndbuf_desc = NULL; ...

		__smc_lgr_terminate
			smc_conn_kill
				smc_close_abort
					smc_cdc_get_slot_and_msg_send

		__softirqentry_text_start
			smc_wr_tx_process_cqe
				smc_cdc_tx_handler
					READ(conn->sndbuf_desc->len);
					/* panic dues to NULL sndbuf_desc */

conn->sndbuf_desc = xxx;

This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups.

This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create().

		smc_smcr_terminate_all

smc_buf_create /* init */ conn->sndbuf_desc = NULL; ...

		__smc_lgr_terminate
			smc_conn_kill
				smc_close_abort
					smc_cdc_get_slot_and_msg_send

		__softirqentry_text_start
			smc_wr_tx_process_cqe
				smc_cdc_tx_handler
					READ(conn->sndbuf_desc->len);
					/* panic dues to NULL sndbuf_desc */

conn->sndbuf_desc = xxx;

This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()

When performing a stress test on SMC-R by rmmod mlx5_ib driver during the wrk/nginx test, we found that there is a probability of triggering a panic while terminating all link groups.

This issue dues to the race between smc_smcr_terminate_all() and smc_buf_create().

		smc_smcr_terminate_all

smc_buf_create /* init */ conn->sndbuf_desc = NULL; ...

		__smc_lgr_terminate
			smc_conn_kill
				smc_close_abort
					smc_cdc_get_slot_and_msg_send

		__softirqentry_text_start
			smc_wr_tx_process_cqe
				smc_cdc_tx_handler
					READ(conn->sndbuf_desc->len);
					/* panic dues to NULL sndbuf_desc */

conn->sndbuf_desc = xxx;

This patch tries to fix the issue by always to check the sndbuf_desc before send any cdc msg, to make sure that no null pointer is seen during cqe processing.