Description
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix blk_mq_tags double free while nr_requests grown In the case user trigger tags grow by queue sysfs attribute nr_requests, hctx->sched_tags will be freed directly and replaced with a new allocated tags, see blk_mq_tag_update_depth(). The problem is that hctx->sched_tags is from elevator->et->tags, while et->tags is still the freed tags, hence later elevator exit will try to free the tags again, causing kernel panic. Fix this problem by replacing et->tags with new allocated tags as well. Noted there are still some long term problems that will require some refactor to be fixed thoroughly[1]. [1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/
Product status
58567d8e95c096ad234963df90a2ca518901f4b6 before 8faee580d63bc2a54a59dcdb7f9ce4de29384fec
f5a6604f7a4405450e4a1f54e5430f47290c500f before 392b1d64911f4de8887fe8b68299fa8bd6e5b923
f5a6604f7a4405450e4a1f54e5430f47290c500f before ba28afbd9eff2a6370f23ef4e6a036ab0cfda409
6.17
Any version before 6.17
6.16.11
6.17.1
6.18-rc1
References
git.kernel.org/...c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec
git.kernel.org/...c/392b1d64911f4de8887fe8b68299fa8bd6e5b923
git.kernel.org/...c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409
