[Xen-changelog] [qemu-xen stable-4.6] exec: fix a glitch in checking dma r/w access

[patchbot@xxxxxxx]

commit 47f168e2da96473ede608a17aa757c11bc90fc5f
Author:     Prasad J Pandit <pjp@xxxxxxxxxxxxxxxxx>
AuthorDate: Mon Jan 25 19:59:50 2016 +0530
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
CommitDate: Fri Feb 5 13:58:51 2016 +0000

    exec: fix a glitch in checking dma r/w access
    
    While checking r/w access in 'memory_access_is_direct' routine
    a glitch in the expression leads to segmentation fault while
    performing dma read operation.
    
    Reported-by: Donghai Zdh <donghai.zdh@xxxxxxxxxxxxxxx>
    Signed-off-by: Prasad J Pandit <pjp@xxxxxxxxxxxxxxxxx>
---
 exec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/exec.c b/exec.c
index 46fe70e..581b57c 100644
--- a/exec.c
+++ b/exec.c
@@ -347,7 +347,7 @@ address_space_translate_internal(AddressSpaceDispatch *d, 
hwaddr addr, hwaddr *x
 static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
 {
     if (memory_region_is_ram(mr)) {
-        return !(is_write && mr->readonly);
+        return (is_write && !mr->readonly);
     }
     if (memory_region_is_romd(mr)) {
         return !is_write;
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#stable-4.6

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