luck/tmp_suning_uos_patched
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lightnvm: wrong offset in bad blk lun calculation

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dev->nr_luns reports the total number of luns available in a device
while dev->luns_per_chnl is the number of luns per channel.

When multiple channels are available, the offset is calculated from a
channel and lun id into a linear array. As it multiplies with
the total number of luns, we go out of bound when channel id > 0 and
causes the kernel to panic when we read a protected kernel memory area.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling 2015-12-29 14:37:56 +01:00 committed by Jens Axboe
parent 48cc661e7f
commit c3293a9ac2
1 changed files with 1 additions and 1 deletions
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2
drivers/lightnvm/gennvm.c
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@ -75,7 +75,7 @@ static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks,
struct nvm_block *blk;
int i;
lun = &gn->luns[(dev->nr_luns * ppa.g.ch) + ppa.g.lun];
lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
for (i = 0; i < nr_blocks; i++) {
if (blks[i] == 0)