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| H A D | dm.c | diff a9cb9f4148ef6bb8fabbdaa85c42b2171fbd5a0d Tue Aug 04 04:25:01 CDT 2020 Johannes Thumshirn <johannes.thumshirn@wdc.com> dm: don't call report zones for more than the user requested
Don't call report zones for more zones than the user actually requested,
otherwise this can lead to out-of-bounds accesses in the callback
functions.
Such a situation can happen if the target's ->report_zones() callback
function returns 0 because we've reached the end of the target and then
restart the report zones on the second target.
We're again calling into ->report_zones() and ultimately into the user
supplied callback function but when we're not subtracting the number of
zones already processed this may lead to out-of-bounds accesses in the
user callbacks.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Fixes: d41003513e61 ("block: rework zone reporting")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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