From: Arnd Bergmann Date: Fri, 14 Jul 2017 12:06:55 +0000 (+0200) Subject: scsi: mpt3sas: fix format overflow warning X-Git-Tag: v4.14-rc1~41^2~255 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bbfd8e8b241bdb4f4f53df1ba36d839441e5fd89;p=platform%2Fkernel%2Flinux-exynos.git scsi: mpt3sas: fix format overflow warning We print the driver name into one string and then add and ID and copy it into a second string of the same length, at which point gcc complains about a possible overflow: drivers/scsi/mpt3sas/mpt3sas_scsih.c: In function '_scsih_probe': drivers/scsi/mpt3sas/mpt3sas_scsih.c:8884:21: error: '_cm' directive writing 3 bytes into a region of size between 1 and 32 [-Werror=format-overflow=] printf(ioc->name, "%s_cm%d", ioc->driver_name, ioc->id); ^~~~~~~~~ drivers/scsi/mpt3sas/mpt3sas_scsih.c:8884:21: note: directive argument in the range [0, 255] drivers/scsi/mpt3sas/mpt3sas_scsih.c:8884:2: note: 'sprintf' output between 5 and 38 bytes into a destination of size 32 sprintf(ioc->name, "%s_cm%d", ioc->driver_name, ioc->id); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Making the first string shorter is sufficient to avoid the warning here, as we know it can only contain either "mpt2sas" or "mpt3sas". Signed-off-by: Arnd Bergmann Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h index 099ab4c..a77bb7d 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.h +++ b/drivers/scsi/mpt3sas/mpt3sas_base.h @@ -970,7 +970,7 @@ struct MPT3SAS_ADAPTER { u8 id; int cpu_count; char name[MPT_NAME_LENGTH]; - char driver_name[MPT_NAME_LENGTH]; + char driver_name[MPT_NAME_LENGTH - 8]; char tmp_string[MPT_STRING_LENGTH]; struct pci_dev *pdev; Mpi2SystemInterfaceRegs_t __iomem *chip;