lightnvm: wrong offset in bad blk lun calculation
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>
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@ -75,7 +75,7 @@ static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks,
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struct nvm_block *blk;
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struct nvm_block *blk;
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int i;
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int i;
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lun = &gn->luns[(dev->nr_luns * ppa.g.ch) + ppa.g.lun];
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lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
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for (i = 0; i < nr_blocks; i++) {
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for (i = 0; i < nr_blocks; i++) {
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if (blks[i] == 0)
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if (blks[i] == 0)
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