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mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
commit84055688b6
upstream. DAMOS tried regions sysfs directory allocation function (damon_sysfs_scheme_regions_alloc()) is not handling the memory allocation failure. In the case, the code will dereference NULL pointer. Handle the failure to avoid such invalid access. Link: https://lkml.kernel.org/r/20231106233408.51159-3-sj@kernel.org Fixes:9277d0367b
("mm/damon/sysfs-schemes: implement scheme region directory") Signed-off-by: SeongJae Park <sj@kernel.org> Cc: <stable@vger.kernel.org> [6.2+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -126,6 +126,9 @@ damon_sysfs_scheme_regions_alloc(void)
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struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions),
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GFP_KERNEL);
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if (!regions)
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return NULL;
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regions->kobj = (struct kobject){};
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INIT_LIST_HEAD(®ions->regions_list);
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regions->nr_regions = 0;
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