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author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2015-02-09 16:42:49 +0300 |
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committer | Jens Axboe <axboe@fb.com> | 2015-02-09 20:22:39 +0300 |
commit | 69abaffec7d47a083739b79e3066cb3730eba72e (patch) | |
tree | e217ce01355ab8b2ca1d58c54c983fda70e026f2 /samples/seccomp/bpf-helper.c | |
parent | 9f9ee1f2b2f94f19437ae2def7c0d6636d7fe02e (diff) | |
download | linux-69abaffec7d47a083739b79e3066cb3730eba72e.tar.xz |
cfq-iosched: handle failure of cfq group allocation
Cfq_lookup_create_cfqg() allocates struct blkcg_gq using GFP_ATOMIC.
In cfq_find_alloc_queue() possible allocation failure is not handled.
As a result kernel oopses on NULL pointer dereference when
cfq_link_cfqq_cfqg() calls cfqg_get() for NULL pointer.
Bug was introduced in v3.5 in commit cd1604fab4f9 ("blkcg: factor
out blkio_group creation"). Prior to that commit cfq group lookup
had returned pointer to root group as fallback.
This patch handles this error using existing fallback oom_cfqq.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Fixes: cd1604fab4f9 ("blkcg: factor out blkio_group creation")
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'samples/seccomp/bpf-helper.c')
0 files changed, 0 insertions, 0 deletions