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![]() With write operation on psi files replacing old trigger with a new one,
the lifetime of its waitqueue is totally arbitrary. Overwriting an
existing trigger causes its waitqueue to be freed and pending poll()
will stumble on trigger->event_wait which was destroyed.
Fix this by disallowing to redefine an existing psi trigger. If a write
operation is used on a file descriptor with an already existing psi
trigger, the operation will fail with EBUSY error.
Also bypass a check for psi_disabled in the psi_trigger_destroy as the
flag can be flipped after the trigger is created, leading to a memory
leak.
Fixes:
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.. | ||
cgroup-internal.h | ||
cgroup-v1.c | ||
cgroup.c | ||
cpuset.c | ||
debug.c | ||
freezer.c | ||
legacy_freezer.c | ||
Makefile | ||
misc.c | ||
namespace.c | ||
pids.c | ||
rdma.c | ||
rstat.c |