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scsi: megaraid_sas: Use scnprintf() for avoiding potential buffer overflow

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Since snprintf() returns the would-be-output size instead of the actual
output size, the succeeding calls may go beyond the given buffer limit.
Fix it by replacing with scnprintf().

Also corrected the wrongly passed limit size.  The remaining buffer size
must be decremented.

Link: https://lore.kernel.org/r/20200315094241.9086-7-tiwai@suse.de
Cc: "James E . J . Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumit Saxena <sumit.saxena@broadcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Takashi Iwai 2020-03-15 10:42:39 +01:00 committed by Martin K. Petersen
parent 6f0cf42474
commit ff33d0e2b9
1 changed files with 4 additions and 3 deletions
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7
drivers/scsi/megaraid/megaraid_sas_base.c
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@ -2987,9 +2987,10 @@ megasas_dump_sys_regs(void __iomem *reg_set, char *buf)
u32 __iomem *reg = (u32 __iomem *)reg_set;
for (i = 0; i < sz / sizeof(u32); i++) {
bytes_wrote += snprintf(loc + bytes_wrote, PAGE_SIZE,
"%08x: %08x\n", (i * 4),
readl(&reg[i]));
bytes_wrote += scnprintf(loc + bytes_wrote,
PAGE_SIZE - bytes_wrote,
"%08x: %08x\n", (i * 4),
readl(&reg[i]));
}
return bytes_wrote;
}