In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
gpib: fix double decrement of descriptor_busy in command_ioctl()<\/p>\n
commit d1857f8296dc (“gpib: fix use-after-free in IO ioctl handlers”)
\nintroduced a descriptor_busy reference counter to pin struct
\ngpib_descriptor across IO ioctl operations. In command_ioctl(), the
\nerror path inside the loop decrements descriptor_busy and breaks, but
\nexecution then falls through to the unconditional decrement after the
\nloop, underflowing the counter to -1.<\/p>\n
This re-enables the use-after-free that the original fix was meant to
\nprevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on
\nan actively-used descriptor and frees it.<\/p>\n
Remove the early decrement from the error path. The post-loop
\ndecrement already handles all exit paths, matching the correct pattern
\nused in read_ioctl() and write_ioctl().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
gpib: fix double decrement of descriptor_busy in command_ioctl()<\/p>\n
commit d1857f8296dc (“gpib: fix use-after-free in IO ioctl handle<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7153","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7153","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=7153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}