linux-kernel - [PATCH 5.4 298/340] mtd: spi-nor: core: Add erase size check for erase command initialization

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Date:   Mon,  1 Mar 2021 17:14:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH 5.4 298/340] mtd: spi-nor: core: Add erase size check for erase command initialization

From: Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>

commit 58fa22f68fcaff20ce4d08a6adffa64f65ccd37d upstream.

Even if erase type is same as previous region, erase size can be different
if the previous region is overlaid region. Since 'region->size' is assigned
to 'cmd->size' for overlaid region, comparing 'erase->size' and 'cmd->size'
can detect previous overlaid region.

Fixes: 5390a8df769e ("mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories")
Cc: stable@...r.kernel.org
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>
[ta: Add Fixes tag and Cc to stable]
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Link: https://lore.kernel.org/r/13d47e8d8991b8a7fd8cc7b9e2a5319c56df35cc.1601612872.git.Takahiro.Kuwano@infineon.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mtd/spi-nor/spi-nor.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1153,6 +1153,7 @@ static int spi_nor_init_erase_cmd_list(s
 			goto destroy_erase_cmd_list;
 
 		if (prev_erase != erase ||
+		    erase->size != cmd->size ||
 		    region->offset & SNOR_OVERLAID_REGION) {
 			cmd = spi_nor_init_erase_cmd(region, erase);
 			if (IS_ERR(cmd)) {