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* [PATCH] mtd: spi-nor: Fix an error code in spi_nor_read_raw()
@ 2019-08-15  8:32 Dan Carpenter
  2019-08-15 10:35 ` walter harms
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Dan Carpenter @ 2019-08-15  8:32 UTC (permalink / raw)
  To: Marek Vasut, Cyrille Pitchen
  Cc: Vignesh Raghavendra, Tudor Ambarus, Richard Weinberger,
	kernel-janitors, linux-mtd, Miquel Raynal, Brian Norris,
	David Woodhouse

The problem is that if "ret" is negative then when we check if
"ret > len", that condition is going to be true because of type
promotion.  So this patch re-orders the code to check for negatives
first and preserve those error codes.

Fixes: f384b352cbf0 ("mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 63af87609bac..986b0754495d 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2903,10 +2903,10 @@ static int spi_nor_read_raw(struct spi_nor *nor, u32 addr, size_t len, u8 *buf)
 
 	while (len) {
 		ret = spi_nor_read_data(nor, addr, len, buf);
-		if (!ret || ret > len)
-			return -EIO;
 		if (ret < 0)
 			return ret;
+		if (!ret || ret > len)
+			return -EIO;
 
 		buf += ret;
 		addr += ret;
-- 
2.20.1


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2019-08-15  8:32 [PATCH] mtd: spi-nor: Fix an error code in spi_nor_read_raw() Dan Carpenter
2019-08-15 10:35 ` walter harms
2019-08-15 14:41   ` Dan Carpenter
2019-08-21  7:35 ` Tudor.Ambarus
2019-08-21  8:21 ` Tudor.Ambarus

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