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Change History

In the Linux kernel, the following vulnerability has been resolved:

zram: do not forget to endio for partial discard requests

As reported by Qu Wenruo and Avinesh Kumar, the following

 getconf PAGESIZE
 65536
 blkdiscard -p 4k /dev/zram0

takes literally forever to complete.  zram doesn't support partial
discards and just returns immediately w/o doing any discard work in such
cases.  The problem is that we forget to endio on our way out, so
blkdiscard sleeps forever in submit_bio_wait().  Fix this by jumping to
end_bio label, which does bio_endio().

https://git.kernel.org/stable/c/2d1f18efccdb8b29552399d024c36b705447e975

https://git.kernel.org/stable/c/35d3300f6357cfaa72db2721dc2b345b19bac5df

https://git.kernel.org/stable/c/68ce397e8236088fc53b9532d383a722288c8194

https://git.kernel.org/stable/c/a02363f71a79b755daa78a70d6b217f9c13c8c85

https://git.kernel.org/stable/c/e3668b371329ea036ff022ce8ecc82f8befcf003