CVE-2021-47198 Information

Description

In the Linux kernel the following vulnerability has been resolved:

scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine

An error is detected with the following report when unloading the driver: \KASAN: use-after-free in lpfc_unreg_rpi+0x1b1b\n The NLP_REG_LOGIN_SEND nlp_flag is set in lpfc_reg_fab_ctrl_node() but the flag is not cleared upon completion of the login.

This allows a second call to lpfc_unreg_rpi() to proceed with nlp_rpi set to LPFC_RPI_ALLOW_ERROR. This results in a use after free access when used as an rpi_ids array index.

Fix by clearing the NLP_REG_LOGIN_SEND nlp_flag in lpfc_mbx_cmpl_fc_reg_login().

Reference

https://git.kernel.org/stable/c/dbebf865b3239595c1d4dba063b122862583b52a https://git.kernel.org/stable/c/79b20beccea3a3938a8500acef4e6b9d7c66142f