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* Coverity: nxp_spifi_read_reg(): Integer handling issues
@ 2019-10-28 23:02 coverity-bot
  0 siblings, 0 replies; only message in thread
From: coverity-bot @ 2019-10-28 23:02 UTC (permalink / raw)
  To: Joachim Eastwood
  Cc: Brian Norris, Ezequiel Garcia, Gustavo A. R. Silva, linux-next


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:

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

f617b9587c16 ("mtd: spi-nor: add driver for NXP SPI Flash Interface (SPIFI)")

Coverity reported the following:

*** CID 1487374:  Integer handling issues  (SIGN_EXTENSION)
/drivers/mtd/spi-nor/nxp-spifi.c: 138 in nxp_spifi_read_reg()
133     	ret = nxp_spifi_set_memory_mode_off(spifi);
134     	if (ret)
135     		return ret;
137     	cmd = SPIFI_CMD_DATALEN(len) |
vvv     CID 1487374:  Integer handling issues  (SIGN_EXTENSION)
vvv     Suspicious implicit sign extension: "opcode" with type "u8" (8 bits, unsigned) is promoted in "opcode << 24" to type "int" (32 bits, signed), then sign-extended to type "unsigned long" (64 bits, unsigned).  If "opcode << 24" is greater than 0x7FFFFFFF, the upper bits of the result will all be 1.
138     	      SPIFI_CMD_OPCODE(opcode) |
141     	writel(cmd, spifi->io_base + SPIFI_CMD);
143     	while (len--)

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

Reported-by: coverity-bot <>
Addresses-Coverity-ID: 1487374 ("Integer handling issues")
Fixes: f617b9587c16 ("mtd: spi-nor: add driver for NXP SPI Flash Interface (SPIFI)")

Thanks for your attention!


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2019-10-28 23:02 Coverity: nxp_spifi_read_reg(): Integer handling issues coverity-bot

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