nvme: Fix potential sign extension issue in nvme_blk_rw()
"lbas" with type "u16" (16 bits, unsigned) is promoted in
"lbas << ns->lba_shift" to type "int" (32 bits, signed), then
sign-extended to type "unsigned long long" (64 bits, unsigned).
If "lbas << ns->lba_shift" is greater than 0x7FFFFFFF, the upper
bits of the result will all be 1.
Fix it by casting "lbas" to "u32".
Reported-by: Coverity (CID: 166730)
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c
index 4448754..59d54eb 100644
--- a/drivers/nvme/nvme.c
+++ b/drivers/nvme/nvme.c
@@ -723,7 +723,7 @@
&c, NULL, IO_TIMEOUT);
if (status)
break;
- temp_len -= lbas << ns->lba_shift;
+ temp_len -= (u32)lbas << ns->lba_shift;
buffer += lbas << ns->lba_shift;
}