[Xen-changelog] [xen-4.0-testing] VT-d: Fix resource leaks on error paths

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Igor Mammedov <imammedo@xxxxxxxxxx>
# Date 1305549685 -3600
# Node ID f9355c999a0f6ed7ed82ca4eef64e8350159b22e
# Parent  0e31cda80a7b50ff752719bea1f6578d6bf16a10
VT-d: Fix resource leaks on error paths

On error exit from functions, maped pages should be unmapped
and acquired locks released.

Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx>
Acked-by: Allen Kay <allen.m.kay@xxxxxxxxx>
xen-unstable changeset:   23343:edcf8fc77b64
xen-unstable date:        Mon May 16 13:29:24 2011 +0100
---


diff -r 0e31cda80a7b -r f9355c999a0f xen/drivers/passthrough/vtd/intremap.c
--- a/xen/drivers/passthrough/vtd/intremap.c    Mon May 16 13:40:51 2011 +0100
+++ b/xen/drivers/passthrough/vtd/intremap.c    Mon May 16 13:41:25 2011 +0100
@@ -213,7 +213,8 @@
     if ( iremap_entries )
         unmap_vtd_domain_page(iremap_entries);
 
-    ir_ctrl->iremap_num++;
+    if ( i < IREMAP_ENTRY_NR ) 
+        ir_ctrl->iremap_num++;
     return i;
 }
 
@@ -249,6 +250,8 @@
         dprintk(XENLOG_ERR VTDPREFIX,
                 "%s: index (%d) get an empty entry!\n",
                 __func__, index);
+        unmap_vtd_domain_page(iremap_entries);
+        spin_unlock_irqrestore(&ir_ctrl->iremap_lock, flags);
         return -EFAULT;
     }
 
@@ -284,7 +287,8 @@
     if ( index < 0 )
     {
         index = alloc_remap_entry(iommu);
-        apic_pin_2_ir_idx[apic][ioapic_pin] = index;
+        if ( index < IREMAP_ENTRY_NR )
+            apic_pin_2_ir_idx[apic][ioapic_pin] = index;
     }
 
     if ( index > IREMAP_ENTRY_NR - 1 )
@@ -549,6 +553,8 @@
         dprintk(XENLOG_ERR VTDPREFIX,
                 "%s: index (%d) get an empty entry!\n",
                 __func__, index);
+        unmap_vtd_domain_page(iremap_entries);
+        spin_unlock_irqrestore(&ir_ctrl->iremap_lock, flags);
         return -EFAULT;
     }
 

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