block: fix infinite loop in badblocks_clear() and badblocks_check()#771
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An infinite loop can occur in both _badblocks_clear() and _badblocks_check()
when BB_OFFSET() equals the start position, resulting in len = 0. This causes
the update_sectors loop to spin forever without making progress:
s += 0; // no advancement
sectors -= 0; // stays positive
goto re_clear; // infinite loop
The bug exists in three code paths:
1. _badblocks_clear() at line 1100 (start before all badblocks)
2. _badblocks_clear() at line 1153 (behind overlap check)
3. _badblocks_check() at line 1240 (behind overlap check)
Add checks in all three locations to ensure len is non-zero before
entering the loop.
Signed-off-by: Ramesh Adhikari <adhikari.resume@gmail.com>
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Pull request for series with
subject: block: fix infinite loop in badblocks_clear() and badblocks_check()
version: 3
url: https://patchwork.kernel.org/project/linux-block/list/?series=1085695