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3fbbf2148a
clang static analysis flags this problem
stream.c:844:9: warning: Use of memory after
it is freed
kfree(bus->defer_msg.msg->buf);
^~~~~~~~~~~~~~~~~~~~~~~
This happens in an error handler cleaning up memory
allocated for elements in a list.
list_for_each_entry(m_rt, &stream->master_list, stream_node) {
bus = m_rt->bus;
kfree(bus->defer_msg.msg->buf);
kfree(bus->defer_msg.msg);
}
And is triggered when the call to sdw_bank_switch() fails.
There are a two problems.
First, when sdw_bank_switch() fails, though it frees memory it
does not clear bus's reference 'defer_msg.msg' to that memory.
The second problem is the freeing msg->buf. In some cases
msg will be NULL so this will dereference a null pointer.
Need to check before freeing.
Fixes:
|
||
---|---|---|
.. | ||
bus_type.c | ||
bus.c | ||
bus.h | ||
cadence_master.c | ||
cadence_master.h | ||
debugfs.c | ||
intel_init.c | ||
intel.c | ||
intel.h | ||
Kconfig | ||
Makefile | ||
master.c | ||
mipi_disco.c | ||
qcom.c | ||
slave.c | ||
stream.c | ||
sysfs_local.h | ||
sysfs_slave_dpn.c | ||
sysfs_slave.c |