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Date: Sun, 15 Nov 2015 01:45:45 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>, "Cathy Avery" <cathy.avery@...cle.com> Subject: [PATCH 3.2 28/60] xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing) 3.2.73-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Cathy Avery <cathy.avery@...cle.com> commit a54c8f0f2d7df525ff997e2afe71866a1a013064 upstream. xen-blkfront will crash if the check to talk_to_blkback() in blkback_changed()(XenbusStateInitWait) returns an error. The driver data is freed and info is set to NULL. Later during the close process via talk_to_blkback's call to xenbus_dev_fatal() the null pointer is passed to and dereference in blkfront_closing. Signed-off-by: Cathy Avery <cathy.avery@...cle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/block/xen-blkfront.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1292,7 +1292,8 @@ static void blkback_changed(struct xenbu break; /* Missed the backend's Closing state -- fallthrough */ case XenbusStateClosing: - blkfront_closing(info); + if (info) + blkfront_closing(info); break; } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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