CVE-2022-49907

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: mdio: fix undefined behavior in bit shift for __mdiobus_register<br /> <br /> Shifting signed 32-bit value by 31 bits is undefined, so changing<br /> significant bit to unsigned. The UBSAN warning calltrace like below:<br /> <br /> UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27<br /> left shift of 1 by 31 places cannot be represented in type &amp;#39;int&amp;#39;<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x7d/0xa5<br /> dump_stack+0x15/0x1b<br /> ubsan_epilogue+0xe/0x4e<br /> __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c<br /> __mdiobus_register+0x49d/0x4e0<br /> fixed_mdio_bus_init+0xd8/0x12d<br /> do_one_initcall+0x76/0x430<br /> kernel_init_freeable+0x3b3/0x422<br /> kernel_init+0x24/0x1e0<br /> ret_from_fork+0x1f/0x30<br />