ublk: snapshot batch commands before preparing I/O - #1025
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The batch prepare path rereads its userspace element array when rolling back a partially prepared batch. Userspace can change an already processed tag before the second read, causing rollback to reject the replacement tag and leave earlier I/O slots prepared. The WARN_ON_ONCE() in the rollback path then fires. Copy the bounded batch into kernel memory before changing any I/O state and use the same snapshot for preparation and rollback. Commit and fetch batches retain the existing chunked userspace walk. Fixes: b256795 ("ublk: handle UBLK_U_IO_PREP_IO_CMDS") Reported-by: syzbot+1a67ee1aa79484801ec6@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=1a67ee1aa79484801ec6 Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com> Reviewed-by: Ming Lei <tom.leiming@gmail.com>
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Pull request for series with
subject: ublk: snapshot batch commands before preparing I/O
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1119269