In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/tegra241-cmdqv: Free the error IRQ before tearing down VINTFs<\/p>\n
tegra241_cmdqv_remove() tears each VINTF down first, then calls free_irq().
\nTearing a VINTF down frees vintf0 and clears cmdqv->vintfs[0]. An error in
\nthat window makes tegra241_cmdqv_isr() read the stale slot and hand it to
\ntegra241_vintf0_handle_error(), which dereferences a NULL or freed pointer.<\/p>\n
Free the IRQ before tearing the VINTFs down. free_irq() waits for in-flight
\nhandlers to finish and blocks new ones, so no ISR can observe a VINTF as it
\nis torn down.<\/p>\n
Note: a user-owned VINTF (viommu) could outlive this teardown, which unmaps
\ncmdqv->base and frees cmdqv->vintfs, so a later viommu close then touches
\nfreed memory. This is neither introduced nor fixed here: a physical IOMMU
\nis not a pluggable device, so iommufd by design holds no reference on the
\none behind a viommu, and this teardown is not expected while that viommu is
\nstill alive.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/tegra241-cmdqv: Free the error IRQ before tearing down VINTFs<\/p>\n
tegra241_cmdqv_remove() tears each VINTF down first, then call<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25835","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25835","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=25835"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25835"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}