mtd: cfi_cmdset_0002: fix crash when erasing/writing AMD cards

Erasing an AMD linear flash card (AM29F016D) crashes after the first
sector has been erased. Likewise, writing to it crashes after two bytes
have been written. The reason is a missing check for a null pointer -
the cmdset_priv field is not set for this type of card.

Fixes: 4844ef8030 ("mtd: cfi_cmdset_0002: Add support for polling status register")
Signed-off-by: Andreas Persson <andreasp56@outlook.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/DB6P189MB05830B3530B8087476C5CFE4C1159@DB6P189MB0583.EURP189.PROD.OUTLOOK.COM
This commit is contained in:
Andreas Persson 2021-07-12 09:54:52 +02:00 коммит произвёл Miquel Raynal
Родитель 45bb1faa29
Коммит 2394e62873
1 изменённых файлов: 1 добавлений и 1 удалений

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@ -119,7 +119,7 @@ static int cfi_use_status_reg(struct cfi_private *cfi)
struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
u8 poll_mask = CFI_POLL_STATUS_REG | CFI_POLL_DQ;
return extp->MinorVersion >= '5' &&
return extp && extp->MinorVersion >= '5' &&
(extp->SoftwareFeatures & poll_mask) == CFI_POLL_STATUS_REG;
}