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Subject[PATCH RESEND] scsi: megaraid_sas: fix panic on loading firmware crashdump
Date
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: Junxiao Bi <junxiao.bi@oracle.com>
---
drivers/scsi/megaraid/megaraid_sas_base.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 80ab9700f1de..3eef0858fa8e 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3153,6 +3153,7 @@ fw_crash_buffer_show(struct device *cdev,
(struct megasas_instance *) shost->hostdata;
u32 size;
unsigned long dmachunk = CRASH_DMA_BUF_SIZE;
+ unsigned long chunk_left_bytes;
unsigned long src_addr;
unsigned long flags;
u32 buff_offset;
@@ -3176,6 +3177,8 @@ 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] +
--
2.17.1
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