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| author |   Paul E. McKenney <paulmck@kernel.org> | 2022-01-27 13:20:49 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-11 15:52:30 -0700 |
| commit | 46470cf85d2b61abd37c6f66c4dacc1bc510d10f (patch) | |
| tree | 3f1adb38825845064a15ba7207f77ebda159db9b /include/linux/cc_platform.h | |
| parent | srcu: Avoid NULL dereference in srcu_torture_stats_print() (diff) | |
| download | wireguard-linux-46470cf85d2b61abd37c6f66c4dacc1bc510d10f.tar.xz wireguard-linux-46470cf85d2b61abd37c6f66c4dacc1bc510d10f.zip | |
srcu: Prevent cleanup_srcu_struct() from freeing non-dynamic ->sda
When an srcu_struct structure is created (but not in a kernel module)
by DEFINE_SRCU() and friends, the per-CPU srcu_data structure is
statically allocated. In all other cases, that structure is obtained
from alloc_percpu(), in which case cleanup_srcu_struct() must invoke
free_percpu() on the resulting ->sda pointer in the srcu_struct pointer.
Which it does.
Except that it also invokes free_percpu() on the ->sda pointer
referencing the statically allocated per-CPU srcu_data structures.
Which free_percpu() is surprisingly OK with.
This commit nevertheless stops cleanup_srcu_struct() from freeing
statically allocated per-CPU srcu_data structures.
Co-developed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Signed-off-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'include/linux/cc_platform.h')
0 files changed, 0 insertions, 0 deletions