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Leon RomanovskyandMartin K. Petersen
a8ddfd2425
When target_get_sess_cmd() fails during session shutdown because percpu_ref_tryget_live() returns false, the command keeps the se_cmd->cmd_cnt pointer that __target_init_cmd() assigned earlier without owning a reference. Final release through target_release_cmd_kref() then issues an unmatched percpu_ref_put(). Commit8e288be860("scsi: target: Pass in cmd counter to use during cmd setup") moved the cmd_cnt assignment ahead of the reference acquisition. Clear se_cmd->cmd_cnt whenever the initial target_get_sess_cmd() fails in target_init_cmd() and target_submit_tmr(), so release performs exactly one matching put per acquired reference. Fixes:8e288be860("scsi: target: Pass in cmd counter to use during cmd setup") Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Reviewed-by: Mike Christie <michael.christie@oracle.com> Link: https://patch.msgid.link/20260722-reference-count-underflow-in-target-v1-1-63ab664f12fd@nvidia.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>