scsi: qedf: Do not touch __user pointer in qedf_dbg_debug_cmd_read() directly

The qedf_dbg_debug_cmd_read() function invokes sprintf() directly on a
__user pointer, which may crash the kernel.

Avoid doing that by using a small on-stack buffer for scnprintf() and then
calling simple_read_from_buffer() which does a proper copy_to_user() call.

Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.")
Link: https://lore.kernel.org/lkml/[email protected]/
Link: https://lore.kernel.org/linux-scsi/[email protected]/
Cc: Saurav Kashyap <[email protected]>
Cc: Rob Evers <[email protected]>
Cc: Johannes Thumshirn <[email protected]>
Cc: David Laight <[email protected]>
Cc: Jozef Bacik <[email protected]>
Cc: Laurence Oberman <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: "Martin K. Petersen" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Laurence Oberman <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Tested-by: Laurence Oberman <[email protected]>
Acked-by: Saurav Kashyap <[email protected]>
Signed-off-by: Oleksandr Natalenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

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