scsi: sg: Avoid sg device teardown race

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Avoid sg device teardown race sg_remove_sfp_usercontext() must not use sg_device_destroy() after calling scsi_device_put(). sg_device_destroy() is accessing the parent scsi_device request_queue which will already be set to NULL when the preceding call to scsi_device_put() removed the last reference to the parent scsi_device. The resulting NULL pointer exception will then crash the kernel.

References

• https://git.kernel.org/stable/c/46af9047523e2517712ae8e71d984286c626e022
• https://git.kernel.org/stable/c/b0d1ebcc1a9560e494ea9b3ee808540db26c5086
• https://git.kernel.org/stable/c/27f58c04a8f438078583041468ec60597841284d