CVE-2024-36476

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RDMA/rtrs: Ensure &amp;#39;ib_sge list&amp;#39; is accessible<br /> <br /> Move the declaration of the &amp;#39;ib_sge list&amp;#39; variable outside the<br /> &amp;#39;always_invalidate&amp;#39; block to ensure it remains accessible for use<br /> throughout the function.<br /> <br /> Previously, &amp;#39;ib_sge list&amp;#39; was declared within the &amp;#39;always_invalidate&amp;#39;<br /> block, limiting its accessibility, then caused a<br /> &amp;#39;BUG: kernel NULL pointer dereference&amp;#39;[1].<br /> ? __die_body.cold+0x19/0x27<br /> ? page_fault_oops+0x15a/0x2d0<br /> ? search_module_extables+0x19/0x60<br /> ? search_bpf_extables+0x5f/0x80<br /> ? exc_page_fault+0x7e/0x180<br /> ? asm_exc_page_fault+0x26/0x30<br /> ? memcpy_orig+0xd5/0x140<br /> rxe_mr_copy+0x1c3/0x200 [rdma_rxe]<br /> ? rxe_pool_get_index+0x4b/0x80 [rdma_rxe]<br /> copy_data+0xa5/0x230 [rdma_rxe]<br /> rxe_requester+0xd9b/0xf70 [rdma_rxe]<br /> ? finish_task_switch.isra.0+0x99/0x2e0<br /> rxe_sender+0x13/0x40 [rdma_rxe]<br /> do_task+0x68/0x1e0 [rdma_rxe]<br /> process_one_work+0x177/0x330<br /> worker_thread+0x252/0x390<br /> ? __pfx_worker_thread+0x10/0x10<br /> <br /> This change ensures the variable is available for subsequent operations<br /> that require it.<br /> <br /> [1] https://lore.kernel.org/linux-rdma/6a1f3e8f-deb0-49f9-bc69-a9b03ecfcda7@fujitsu.com/