The fsl edma events store a pointer to a struct fsl_edma_engine in the
ringbuffer and dereference it when a log entry is printed. At this time,
the pointer may no longer be valid.
Event injection can be used to trigger a crash:
$ cd /sys/kernel/tracing
$ echo 'value = 0' > events/fsl_edma/edma_writeb/inject
$ cat trace
The log output needs only edma->membase. Add a membase field at the end
of the event and use the new field for log output. Keep the existing
fields for backward compatibility.
Fixes: 11102d0c34 ("dmaengine: fsl-edma: add trace event support")
Cc: stable@vger.kernel.org
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260718130024.341243-1-martin@kaiser.cx
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2ea04dca8e