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ar71xx: fix invalid pointer dereference in rb95x_nand_scan_fixup()

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Since Linux 4.6, mtd->priv no longer points to the NAND specific
structure. Under 4.9 it contains NULL, thus using it to access
chip->options causes an invalid pointer dereference (FS#1200).

Update the code to use the mtd_to_nand() helper under 4.9 to obtain
the address of the chip specific data.

Fixes: 7bbf4117c6 ("ar71xx: Add kernel 4.9 support")
Signed-off-by: Gabor Juhos <juhosg@freemail.hu>
This commit is contained in:
Gabor Juhos 2017-12-12 21:49:50 +01:00 committed by John Crispin
parent 2ecc413107
commit 665bb27499
1 changed files with 4 additions and 0 deletions
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target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c
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@ -207,7 +207,11 @@ static const struct mtd_ooblayout_ops rb95x_nand_ecclayout_ops = {
static int rb95x_nand_scan_fixup(struct mtd_info *mtd)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
struct nand_chip *chip = mtd->priv;
#else
struct nand_chip *chip = mtd_to_nand(mtd);
#endif /* < 4.6.0 */
if (mtd->writesize == 512) {
/*