In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking<\/p>\n
qla25xx_free_req_que() and qla25xx_free_rsp_que() have two pre-existing
\nbugs exposed on the error path of qla25xx_create_{req,rsp}_que():<\/p>\n
1. When dma_alloc_coherent() fails during queue creation, the error
\n path calls the free function with req->ring \/ rsp->ring still NULL
\n (from kzalloc). The unconditional dma_free_coherent() with a NULL
\n cpu_addr is undefined behavior and can panic.<\/p>\n
2. The free functions clear req_qid_map \/ rsp_qid_map under vport_lock,
\n but the create functions protect the same bitmaps with mq_lock.
\n This provides no mutual exclusion. Additionally, the create error
\n path clears the bit and releases mq_lock before calling the free
\n function, creating a window where another thread can allocate the
\n same que_id and have its ha->req_q_map entry clobbered by the
\n subsequent lockless NULL assignment in the free function.<\/p>\n
Fix by:<\/p>\n
– Guarding dma_free_coherent() with a NULL check on the ring pointer.<\/p>\n
– Using mq_lock (the lock held by all creators) in the free functions
\n to atomically NULL the map entry and clear the bitmap bit.<\/p>\n
– Removing the now-redundant clear_bit blocks from the create error
\n paths since the free functions handle it atomically.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking<\/p>\n
qla25xx_free_req_que() and qla25xx_free_rsp_que() have two pre-<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28969","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}