Coverity: spi_nor_erase_sector(): Null pointer dereferences

[coverity-bot <keescook@chromium.org>]

Hello!

This is an experimental automated report about issues detected by Coverity
from a scan of next-20191025 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by recent commits:

453977875364 ("mtd: spi-nor: Introduce 'struct spi_nor_controller_ops'")

Coverity reported the following:

*** CID 1487363:  Null pointer dereferences  (FORWARD_NULL)
/drivers/mtd/spi-nor/spi-nor.c: 967 in spi_nor_erase_sector()
961     	 */
962     	for (i = nor->addr_width - 1; i >= 0; i--) {
963     		nor->bouncebuf[i] = addr & 0xff;
964     		addr >>= 8;
965     	}
966
vvv     CID 1487363:  Null pointer dereferences  (FORWARD_NULL)
vvv     Dereferencing null pointer "nor->controller_ops".
967     	return nor->controller_ops->write_reg(nor, nor->erase_opcode,
968     					      nor->bouncebuf, nor->addr_width);
969     }
970
971     /**
972      * spi_nor_div_by_erase_size() - calculate remainder and update new dividend

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include:

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487363 ("Null pointer dereferences")
Fixes: 453977875364 ("mtd: spi-nor: Introduce 'struct spi_nor_controller_ops'")


Thanks for your attention!

-- 
Coverity-bot