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lightnvm: check overflow and correct mlc pairs

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The specification currently limits the number of MLC pairs to 886. Make
sure that a device is unable to be instantiate if more is configured.

Also, previously the patch had the wrong math for copying MLC pairs, as
it only copied half of the actual entries.

Fixes: ca5927e7ab "lightnvm: introduce mlc lower page table mappings"
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling 2016-02-04 15:13:26 +01:00 committed by Jens Axboe
parent 3704e098cc
commit 6dde1d6c90
1 changed files with 9 additions and 3 deletions
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12
drivers/nvme/host/lightnvm.c
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@ -146,9 +146,10 @@ struct nvme_nvm_command {
};
};
#define NVME_NVM_LP_MLC_PAIRS 886
struct nvme_nvm_lp_mlc {
__u16 num_pairs;
__u8 pairs[886];
__u8 pairs[NVME_NVM_LP_MLC_PAIRS];
};
struct nvme_nvm_lp_tbl {
@ -282,9 +283,14 @@ static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id)
memcpy(dst->lptbl.id, src->lptbl.id, 8);
dst->lptbl.mlc.num_pairs =
le16_to_cpu(src->lptbl.mlc.num_pairs);
/* 4 bits per pair */
if (dst->lptbl.mlc.num_pairs > NVME_NVM_LP_MLC_PAIRS) {
pr_err("nvm: number of MLC pairs not supported\n");
return -EINVAL;
}
memcpy(dst->lptbl.mlc.pairs, src->lptbl.mlc.pairs,
dst->lptbl.mlc.num_pairs >> 1);
dst->lptbl.mlc.num_pairs);
}
}