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@xxxxxxxxxxx>
---
drivers/lightnvm/gennvm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 04aead4..12ddcaa 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -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)
--
2.1.4
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