Overview
About vulnerability
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.
Details
- Affected product:
- AlmaLinux 9.2 ESU , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , TuxCare 9.6 ESU
- Affected packages:
- kernel @ 4.18.0 (+4 more)
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.