In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/nouveau\/uvmm: fix premature region free on failed OP_UNMAP_SPARSE<\/p>\n
In nouveau_uvmm_bind_job_submit()’s OP_UNMAP_SPARSE arm, op->reg is set
\nfrom nouveau_uvma_region_find(), which only looks the region up and takes
\nno reference; a region’s sole reference is its membership in
\nuvmm->region_mt. Two failure paths leave op->reg set: the -ENOENT check
\nwhen the region is busy, and the drm_gpuvm_sm_unmap_ops_create() failure.
\nThe sibling nouveau_uvmm_sm_unmap_prepare() failure just below clears
\nop->reg; these two do not.<\/p>\n
unwind_continue steps back one op, so the failing op is skipped by the
\nunwind loop and its op->reg stays set. nouveau_uvmm_bind_job_cleanup()
\nthen enters its if (op->reg) branch and calls nouveau_uvma_region_remove()
\nand nouveau_uvma_region_put() on it, dropping the tree’s sole reference
\nand freeing a region this job never created. The comment above the
\ncleanup loop documents the broken invariant: op->reg must be NULL on
\nsubmit failure.<\/p>\n
This frees a live region on an unrelated failure, reachable single-job
\nwhen drm_gpuvm_sm_unmap_ops_create() returns -ENOMEM; if another job owns
\nthe same region, its cleanup then removes and puts the freed region, a
\nuse-after-free. Clear op->reg on both failure paths.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/nouveau\/uvmm: fix premature region free on failed OP_UNMAP_SPARSE<\/p>\n
In nouveau_uvmm_bind_job_submit()’s OP_UNMAP_SPARSE arm, op-<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24488","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24488","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=24488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24488"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}