net/smc: fix UAF on lgr list traversal in smcr_port_err()

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smcr_port_err() traverses smc_lgr_list.list without holding
smc_lgr_list.lock, allowing a concurrent smc_lgr_terminate_sched()
to free an lgr while it is still being dereferenced.

Hold smc_lgr_list.lock across the traversal. Update
smc_ib_gid_check() to call smcr_port_err() after releasing the lock.

Fixes: 541afa10c1 ("net/smc: add smcr_port_err() and smcr_link_down() processing")
Reviewed-by: Mahanta Jambigi <mjambigi@linux.ibm.com>
Signed-off-by: Sidraya Jayagond <sidraya@linux.ibm.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Link: https://patch.msgid.link/20260922073149.474762-1-sidraya@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Sidraya Jayagond 2026-09-22 09:31:49 +02:00 • committed by Jakub Kicinski

parent ba3d1f480c

commit 61cb282fe9

2 changed files with 10 additions and 2 deletions

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2

net/smc/smc_core.c

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10

net/smc/smc_ib.c

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