[PATCH 5.11 694/775] mtd: spi-nor: sfdp: Fix wrong erase type bitmask for overlaid region

[Greg Kroah-Hartman]

From: Takahiro Kuwano <Takahiro.Kuwano@xxxxxxxxxxxx>

commit abdf5a5ef9652bad4d58058bc22ddf23543ba3e1 upstream.

At the time spi_nor_region_check_overlay() is called, the erase types are
sorted in ascending order of erase size. The 'erase_type' should be masked
with 'BIT(erase[i].idx)' instead of 'BIT(i)'.

Fixes: b038e8e3be72 ("mtd: spi-nor: parse SFDP Sector Map Parameter Table")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@xxxxxxxxxxxx>
[ta: Add Fixes tag and Cc to stable]
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/fd90c40d5b626a1319a78fc2bcee79a8871d4d57.1601612872.git.Takahiro.Kuwano@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/mtd/spi-nor/sfdp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -788,7 +788,7 @@ spi_nor_region_check_overlay(struct spi_
 	int i;
 
 	for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
-		if (!(erase_type & BIT(i)))
+		if (!(erase[i].size && erase_type & BIT(erase[i].idx)))
 			continue;
 		if (region->size & erase[i].size_mask) {
 			spi_nor_region_mark_overlay(region);