In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
interconnect: Fix use after free in icc_get() and of_icc_get_by_index()<\/p>\n
In of_icc_get_by_index() and icc_get(), if the dynamic allocation for
\npath->name fails via kasprintf(), the error handling path directly
\ncalls kfree(path) to free the path object and returns an error.<\/p>\n
However, prior to this point, path_find() calls path_init(), which
\nalready links the path’s requests into the req_list of the respective
\ninterconnect nodes via hlist_add_head(). Directly invoking kfree(path)
\nleaves dangling pointers in the hlist. A subsequent call to icc_get()
\nor icc_set_bw() will traverse or modify these corrupted lists, triggering
\na slab use afterfree.<\/p>\n
KASAN report showing the vulnerability when reproducing via debugfs:<\/p>\n
BUG: KASAN: slab-use-after-free in path_find+0x6f8\/0xcfc
\n Write of size 8 at addr fff000000d43f748 by task sh\/1
\n …
\n Call trace:
\n kasan_report+0xac\/0xfc
\n path_find+0x6f8\/0xcfc
\n icc_get+0x148\/0x380
\n icc_get_set+0xf8\/0x2d0
\n …
\n Freed by task 1:
\n kfree+0x1a0\/0x4a4
\n icc_get+0x2cc\/0x380
\n icc_get_set+0xf8\/0x2d0<\/p>\n
Fix this by replacing kfree(path) with the proper teardown function,
\nicc_put(path), which safely removes the requests from the req_list using
\nhlist_del() and drops the provider usage references before freeing the
\nmemory.<\/p>\n
Additionally, in icc_get(), ensure that the icc_lock mutex is released
\nprior to calling icc_put(path) to avoid a deadlock, as icc_put()
\ninternally acquires the same lock.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
interconnect: Fix use after free in icc_get() and of_icc_get_by_index()<\/p>\n
In of_icc_get_by_index() and icc_get(), if the dynamic all<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21341","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21341","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=21341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}