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From: John Snow <jsnow@redhat.com>
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Date: Wed, 10 Feb 2016 13:29:40 -0500
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Subject: [PATCH] ahci: Do not unmap NULL addresses
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Definitely don't try to unmap a garbage address.
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Reported-by: Zuozhi fzz <zuozhi.fzz@alibaba-inc.com>
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Signed-off-by: John Snow <jsnow@redhat.com>
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Message-id: 1454103689-13042-2-git-send-email-jsnow@redhat.com
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(cherry picked from commit 99b4cb71069f109b79b27bc629fc0cf0886dbc4b)
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---
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hw/ide/ahci.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
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index 17f1cbd..cdc9299 100644
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--- a/hw/ide/ahci.c
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+++ b/hw/ide/ahci.c
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@@ -661,6 +661,10 @@ static bool ahci_map_fis_address(AHCIDevice *ad)
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static void ahci_unmap_fis_address(AHCIDevice *ad)
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{
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+ if (ad->res_fis == NULL) {
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+ DPRINTF(ad->port_no, "Attempt to unmap NULL FIS address\n");
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+ return;
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+ }
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dma_memory_unmap(ad->hba->as, ad->res_fis, 256,
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DMA_DIRECTION_FROM_DEVICE, 256);
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ad->res_fis = NULL;
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@@ -677,6 +681,10 @@ static bool ahci_map_clb_address(AHCIDevice *ad)
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static void ahci_unmap_clb_address(AHCIDevice *ad)
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{
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+ if (ad->lst == NULL) {
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+ DPRINTF(ad->port_no, "Attempt to unmap NULL CLB address\n");
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+ return;
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+ }
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dma_memory_unmap(ad->hba->as, ad->lst, 1024,
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DMA_DIRECTION_FROM_DEVICE, 1024);
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ad->lst = NULL;
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