| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 191/306] irq/matrix: Fix memory overallocation | Date | Wed, 27 Nov 2019 21:30:41 +0100 |
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From: Michael Kelley <mikelley@microsoft.com>
[ Upstream commit 57f01796f14fecf00d330fe39c8d2477ced9cd79 ]
IRQ_MATRIX_SIZE is the number of longs needed for a bitmap, multiplied by the size of a long, yielding a byte count. But it is used to size an array of longs, which is way more memory than is needed.
Change IRQ_MATRIX_SIZE so it is just the number of longs needed and the arrays come out the correct size.
Fixes: 2f75d9e1c905 ("genirq: Implement bitmap matrix allocator") Signed-off-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: KY Srinivasan <kys@microsoft.com> Link: https://lkml.kernel.org/r/1541032428-10392-1-git-send-email-mikelley@microsoft.com Signed-off-by: Sasha Levin <sashal@kernel.org> --- kernel/irq/matrix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/irq/matrix.c b/kernel/irq/matrix.c index 92337703ca9fd..30cc217b86318 100644 --- a/kernel/irq/matrix.c +++ b/kernel/irq/matrix.c @@ -8,7 +8,7 @@ #include <linux/cpu.h> #include <linux/irq.h> -#define IRQ_MATRIX_SIZE (BITS_TO_LONGS(IRQ_MATRIX_BITS) * sizeof(unsigned long)) +#define IRQ_MATRIX_SIZE (BITS_TO_LONGS(IRQ_MATRIX_BITS)) struct cpumap { unsigned int available; -- 2.20.1
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