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binder_alloc: Fix sleeping function called from invalid context

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36c55ce870 ("binder_alloc: Replace kcalloc with kvcalloc to
mitigate OOM issues") introduced schedule while atomic issue.

[ 2689.152635][ T4275] BUG: sleeping function called from invalid context at mm/vmalloc.c:2847
[ 2689.161291][ T4275] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4275, name: kworker/1:140
[ 2689.170708][ T4275] preempt_count: 1, expected: 0
[ 2689.175572][ T4275] RCU nest depth: 0, expected: 0
[ 2689.180521][ T4275] INFO: lockdep is turned off.
[ 2689.180523][ T4275] Preemption disabled at:
[ 2689.180525][ T4275] [<ffffffe031f2a2dc>] binder_alloc_deferred_release+0x2c/0x388
..
..
[ 2689.213419][ T4275]  __might_resched+0x174/0x178
[ 2689.213423][ T4275]  __might_sleep+0x48/0x7c
[ 2689.213426][ T4275]  vfree+0x4c/0x15c
[ 2689.213430][ T4275]  kvfree+0x24/0x44
[ 2689.213433][ T4275]  binder_alloc_deferred_release+0x2c0/0x388
[ 2689.213436][ T4275]  binder_proc_dec_tmpref+0x15c/0x2a8
[ 2689.213440][ T4275]  binder_deferred_func+0xa8/0x8ec
[ 2689.213442][ T4275]  process_one_work+0x254/0x59c
[ 2689.213447][ T4275]  worker_thread+0x274/0x3ec
[ 2689.213450][ T4275]  kthread+0x110/0x134
[ 2689.213453][ T4275]  ret_from_fork+0x10/0x20

Fix it by moving the place of kvfree outside of spinlock context.

Fixes: 36c55ce870 ("binder_alloc: Replace kcalloc with kvcalloc to mitigate OOM issues")
Acked-by: Carlos Llamas <cmllamas@google.com>
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Link: https://lore.kernel.org/r/20240725062510.2856662-1-quic_mojha@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mukesh Ojha 2024-07-25 11:55:10 +05:30 committed by Greg Kroah-Hartman
parent 11512c197d
commit 2c10a20f5e
1 changed files with 1 additions and 1 deletions
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2
drivers/android/binder_alloc.c
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@ -939,9 +939,9 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
__free_page(alloc->pages[i].page_ptr);
page_count++;
}
kvfree(alloc->pages);
}
spin_unlock(&alloc->lock);
kvfree(alloc->pages);
if (alloc->mm)
mmdrop(alloc->mm);