dm cache: handle kmalloc failure allocating background_tracker struct
Currently there is no kmalloc failure check on the allocation of
the background_tracker struct in btracker_create(), and so a NULL return
will lead to a NULL pointer dereference. Add a NULL check.
Detected by CoverityScan, CID#1416587 ("Dereference null return value")
Fixes: b29d4986d
("dm cache: significant rework to leverage dm-bio-prison-v2")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -33,6 +33,11 @@ struct background_tracker *btracker_create(unsigned max_work)
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{
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{
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struct background_tracker *b = kmalloc(sizeof(*b), GFP_KERNEL);
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struct background_tracker *b = kmalloc(sizeof(*b), GFP_KERNEL);
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if (!b) {
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DMERR("couldn't create background_tracker");
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return NULL;
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}
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b->max_work = max_work;
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b->max_work = max_work;
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atomic_set(&b->pending_promotes, 0);
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atomic_set(&b->pending_promotes, 0);
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atomic_set(&b->pending_writebacks, 0);
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atomic_set(&b->pending_writebacks, 0);
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