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samples/damon/mtier: support boot time enable setup

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commit 964314344e upstream.

If 'enable' parameter of the 'mtier' DAMON sample module is set at boot
time via the kernel command line, memory allocation is tried before the
slab is initialized.  As a result kernel NULL pointer dereference BUG can
happen.  Fix it by checking the initialization status.

Link: https://lkml.kernel.org/r/20250706193207.39810-4-sj@kernel.org
Fixes: 82a08bde3c ("samples/damon: implement a DAMON module for memory tiering")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
SeongJae Park 2025-07-06 12:32:04 -07:00 committed by Greg Kroah-Hartman
parent a10eb32570
commit dd1f0f4bfb
1 changed files with 10 additions and 0 deletions
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10
samples/damon/mtier.c
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@ -151,6 +151,8 @@ static void damon_sample_mtier_stop(void)
damon_destroy_ctx(ctxs[1]);
}
static bool init_called;
static int damon_sample_mtier_enable_store(
const char *val, const struct kernel_param *kp)
{
@ -176,6 +178,14 @@ static int damon_sample_mtier_enable_store(
static int __init damon_sample_mtier_init(void)
{
int err = 0;
init_called = true;
if (enable) {
err = damon_sample_mtier_start();
if (err)
enable = false;
}
return 0;
}