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Subject[PATCH 5.13 787/800] scsi: libfc: Correct the condition check and invalid argument passed
Date
From: Javed Hasan <jhasan@marvell.com>

commit 8f70328c068f9f5c5db82848724cb276f657b9cd upstream.

Incorrect condition check was leading to data corruption.

Link: https://lore.kernel.org/r/20210603101404.7841-3-jhasan@marvell.com
Fixes: 8fd9efca86d0 ("scsi: libfc: Work around -Warray-bounds warning")
CC: stable@vger.kernel.org
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Javed Hasan <jhasan@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/libfc/fc_encode.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/scsi/libfc/fc_encode.h
+++ b/drivers/scsi/libfc/fc_encode.h
@@ -166,9 +166,11 @@ static inline int fc_ct_ns_fill(struct f
static inline void fc_ct_ms_fill_attr(struct fc_fdmi_attr_entry *entry,
const char *in, size_t len)
{
- int copied = strscpy(entry->value, in, len);
- if (copied > 0)
- memset(entry->value, copied, len - copied);
+ int copied;
+
+ copied = strscpy((char *)&entry->value, in, len);
+ if (copied > 0 && (copied + 1) < len)
+ memset((entry->value + copied + 1), 0, len - copied - 1);
}

/**

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