block: clear ia_ranges on sysfs registration failure - #1142
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disk_register_independent_access_ranges() clears disk->ia_ranges when creating the top-level kobject fails. However, if adding one of the range kobjects fails, the cleanup drops the final reference to iars and frees it while disk->ia_ranges still points at it. A concurrent disk revalidation can wait for q->sysfs_lock and then call disk_unregister_independent_access_ranges(), which dereferences the stale pointer after registration releases the mutex. Clear disk->ia_ranges before dropping the kobject references on the child registration error path, matching the top-level error handling. Fixes: a2247f1 ("block: Add independent access ranges support") Cc: stable@vger.kernel.org Signed-off-by: Shuangpeng Bai <shuangpeng.kernel@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
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Pull request for series with
subject: block: clear ia_ranges on sysfs registration failure
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1146317