جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bic_set_bfqq() After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"), bic->bfqq will be accessed in bic_set_bfqq(), however, in some context bic->bfqq will be freed, and bic_set_bfqq() is called with the freed bic->bfqq. Fix the problem by always freeing bfqq after bic_set_bfqq().

• https://git.kernel.org/stable/c/7f77f3dab5066a7c9da73d72d1eee895ff84a8d5
• https://git.kernel.org/stable/c/511c922c5bf6c8a166bea826e702336bc2424140
• https://git.kernel.org/stable/c/cb1876fc33af26d00efdd473311f1b664c77c44e
• https://git.kernel.org/stable/c/b600de2d7d3a16f9007fad1bdae82a3951a26af2