[PATCH][next] mtd: nand: Fix error handling in nand_prog_page_op

[PATCH][next] mtd: nand: Fix error handling in nand_prog_page_op

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

The less than zero comparison with status is always false because status
is a u8. Fix this by using ret as the return check for the call to
chip->legacy.waitfunc() and checking on this and assigning status to ret
if it is OK.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 52f67def97f1 ("mtd: nand: fix error handling in nand_prog_page_op() #1")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/mtd/nand/raw/nand_base.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 0f6babefaed2..4f263c22c80d 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -1462,9 +1462,10 @@ int nand_prog_page_op(struct nand_chip *chip, unsigned int page,
 				     page);
 		chip->legacy.write_buf(chip, buf, len);
 		chip->legacy.cmdfunc(chip, NAND_CMD_PAGEPROG, -1, -1);
-		status = chip->legacy.waitfunc(chip);
-		if (status < 0)
-			return status;
+		ret = chip->legacy.waitfunc(chip);
+		if (ret < 0)
+			return ret;
+		status = ret;
 	}
 
 	if (status & NAND_STATUS_FAIL)
-- 
2.30.0


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Re: [PATCH][next] mtd: nand: Fix error handling in nand_prog_page_op

[Miquel Raynal]

Hi Colin,

Colin King <colin.king@canonical.com> wrote on Wed,  3 Mar 2021
09:42:46 +0000:

> From: Colin Ian King <colin.king@canonical.com>
> 
> The less than zero comparison with status is always false because status
> is a u8. Fix this by using ret as the return check for the call to
> chip->legacy.waitfunc() and checking on this and assigning status to ret
> if it is OK.
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: 52f67def97f1 ("mtd: nand: fix error handling in nand_prog_page_op() #1")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Thanks for the fix, but this has been handled just an hour ago :)

Cheers,
Miquèl

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Re: [PATCH][next] mtd: nand: Fix error handling in nand_prog_page_op

[Colin Ian King]

On 03/03/2021 09:46, Miquel Raynal wrote:
> Hi Colin,
> 
> Colin King <colin.king@canonical.com> wrote on Wed,  3 Mar 2021
> 09:42:46 +0000:
> 
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> The less than zero comparison with status is always false because status
>> is a u8. Fix this by using ret as the return check for the call to
>> chip->legacy.waitfunc() and checking on this and assigning status to ret
>> if it is OK.
>>
>> Addresses-Coverity: ("Unsigned compared against 0")
>> Fixes: 52f67def97f1 ("mtd: nand: fix error handling in nand_prog_page_op() #1")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> 
> Thanks for the fix, but this has been handled just an hour ago :)

Ah, missed that. Glad to know it's fixed.

> 
> Cheers,
> Miquèl
> 


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