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Commit f254faed authored by Junxiao Bi's avatar Junxiao Bi Committed by Greg Kroah-Hartman
Browse files

scsi: megaraid_sas: fix panic on loading firmware crashdump 



[ Upstream commit 3b5f307ef3cb5022bfe3c8ca5b8f2114d5bf6c29 ]

While loading fw crashdump in function fw_crash_buffer_show(), left bytes
in one dma chunk was not checked, if copying size over it, overflow access
will cause kernel panic.

Signed-off-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
Acked-by: default avatarSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent bb41940c

drivers/scsi/megaraid/megaraid_sas_base.c

+3 −0
Original line number Diff line number Diff line
@@ -3025,6 +3025,7 @@ megasas_fw_crash_buffer_show(struct device *cdev, 
	u32 size;

	unsigned long buff_addr;

	unsigned long dmachunk = CRASH_DMA_BUF_SIZE;

	unsigned long chunk_left_bytes;

	unsigned long src_addr;

	unsigned long flags;

	u32 buff_offset;
@@ -3050,6 +3051,8 @@ megasas_fw_crash_buffer_show(struct device *cdev, 
	}



	size = (instance->fw_crash_buffer_size * dmachunk) - buff_offset;

	chunk_left_bytes = dmachunk - (buff_offset % dmachunk);

	size = (size > chunk_left_bytes) ? chunk_left_bytes : size;

	size = (size >= PAGE_SIZE) ? (PAGE_SIZE - 1) : size;



	src_addr = (unsigned long)instance->crash_buf[buff_offset / dmachunk] +