linux-kernel - [ 08/24] xhci: check for failed dma pool allocation

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Message-Id: <20130719022404.583774910@linuxfoundation.org>
Date:	Thu, 18 Jul 2013 19:24:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	John Youn <johnyoun@...opsys.com>
Subject: [ 08/24] xhci: check for failed dma pool allocation

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mathias Nyman <mathias.nyman@...ux.intel.com>

commit 025f880cb2e4d7218d0422d4b07bea1a68959c38 upstream.

Fail and free the container context in case dma_pool_alloc() can't allocate
the raw context data part of it

This patch should be backported to kernels as old as 2.6.31, that
contain the commit d115b04818e57bdbc7ccde4d0660b15e33013dc8 "USB: xhci:
Support for 64-byte contexts".

Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc: John Youn <johnyoun@...opsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/xhci-mem.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -369,6 +369,10 @@ static struct xhci_container_ctx *xhci_a
 		ctx->size += CTX_SIZE(xhci->hcc_params);
 
 	ctx->bytes = dma_pool_alloc(xhci->device_pool, flags, &ctx->dma);
+	if (!ctx->bytes) {
+		kfree(ctx);
+		return NULL;
+	}
 	memset(ctx->bytes, 0, ctx->size);
 	return ctx;
 }


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