slub: fix a possible memleak in __slab_alloc()
Zhihua Che reported a possible memleak in slub allocator on CONFIG_PREEMPT=y builds. It is possible current thread migrates right before disabling irqs in __slab_alloc(). We must check again c->freelist, and perform a normal allocation instead of scratching c->freelist. Many thanks to Zhihua Che for spotting this bug, introduced in 2.6.39 V2: Its also possible an IRQ freed one (or several) object(s) and populated c->freelist, so its not a CONFIG_PREEMPT only problem. Cc: <stable@vger.kernel.org> [2.6.39+] Reported-by: NZhihua Che <zhihua.che@gmail.com> Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Acked-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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