linux-kernel - [tip:irq/core] irqchip/gicv3-its: Add range check for number of allocated pages

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Message-ID: <tip-30f2136346cab91e1ffd9ee6370d76809f20487a@git.kernel.org>
Date:	Tue, 29 Sep 2015 01:15:41 -0700
From:	tip-bot for Robert Richter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tchalamarla@...ium.com, jason@...edaemon.net,
	linux-kernel@...r.kernel.org, hpa@...or.com, marc.zyngier@....com,
	tglx@...utronix.de, mingo@...nel.org, catalin.marinas@....com,
	rrichter@...ium.com
Subject: [tip:irq/core] irqchip/gicv3-its:
  Add range check for number of allocated pages

Commit-ID:  30f2136346cab91e1ffd9ee6370d76809f20487a
Gitweb:     http://git.kernel.org/tip/30f2136346cab91e1ffd9ee6370d76809f20487a
Author:     Robert Richter <rrichter@...ium.com>
AuthorDate: Mon, 21 Sep 2015 22:58:34 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 29 Sep 2015 10:10:53 +0200

irqchip/gicv3-its: Add range check for number of allocated pages

The number of pages for the its table may exceed the maximum of 256.
Adding a range check and limitting the number to its maximum.

Based on a patch from Tirumalesh Chalamarla <tchalamarla@...ium.com>.

Signed-off-by: Tirumalesh Chalamarla <tchalamarla@...ium.com>
Signed-off-by: Robert Richter <rrichter@...ium.com>
Reviewed-by: Marc Zyngier <marc.zyngier@....com>
Acked-by: Catalin Marinas <catalin.marinas@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: Jason Cooper <jason@...edaemon.net>
Link: http://lkml.kernel.org/r/1442869119-1814-2-git-send-email-rric@kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/irqchip/irq-gic-v3-its.c   | 11 ++++++++++-
 include/linux/irqchip/arm-gic-v3.h |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index ac7ae2b..d9052fd 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -822,6 +822,7 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
 		u64 entry_size = GITS_BASER_ENTRY_SIZE(val);
 		int order = get_order(psz);
 		int alloc_size;
+		int alloc_pages;
 		u64 tmp;
 		void *base;
 
@@ -856,6 +857,14 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
 		}
 
 		alloc_size = (1 << order) * PAGE_SIZE;
+		alloc_pages = (alloc_size / psz);
+		if (alloc_pages > GITS_BASER_PAGES_MAX) {
+			alloc_pages = GITS_BASER_PAGES_MAX;
+			order = get_order(GITS_BASER_PAGES_MAX * psz);
+			pr_warn("%s: Device Table too large, reduce its page order to %u (%u pages)\n",
+				node_name, order, alloc_pages);
+		}
+
 		base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 		if (!base) {
 			err = -ENOMEM;
@@ -884,7 +893,7 @@ retry_baser:
 			break;
 		}
 
-		val |= (alloc_size / psz) - 1;
+		val |= alloc_pages - 1;
 
 		writeq_relaxed(val, its->base + GITS_BASER + i * 8);
 		tmp = readq_relaxed(its->base + GITS_BASER + i * 8);
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 9eeeb95..c0c8a2e 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -231,6 +231,7 @@
 #define GITS_BASER_PAGE_SIZE_16K	(1UL << GITS_BASER_PAGE_SIZE_SHIFT)
 #define GITS_BASER_PAGE_SIZE_64K	(2UL << GITS_BASER_PAGE_SIZE_SHIFT)
 #define GITS_BASER_PAGE_SIZE_MASK	(3UL << GITS_BASER_PAGE_SIZE_SHIFT)
+#define GITS_BASER_PAGES_MAX		256
 
 #define GITS_BASER_TYPE_NONE		0
 #define GITS_BASER_TYPE_DEVICE		1
--
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