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[PATCH v3] exec: set map length to zero when returning NULL
From: |
P J P |
Subject: |
[PATCH v3] exec: set map length to zero when returning NULL |
Date: |
Tue, 26 May 2020 13:20:42 +0530 |
From: Prasad J Pandit <address@hidden>
When mapping physical memory into host's virtual address space,
'address_space_map' may return NULL if BounceBuffer is in_use.
Set and return '*plen = 0' to avoid later NULL pointer dereference.
Reported-by: Alexander Bulekov <address@hidden>
Fixes: https://bugs.launchpad.net/qemu/+bug/1878259
Signed-off-by: Prasad J Pandit <address@hidden>
---
exec.c | 1 +
1 file changed, 1 insertion(+)
Update v3: set *plen = 0;
-> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg06249.html
diff --git a/exec.c b/exec.c
index 5162f0d12f..4eea84bf66 100644
--- a/exec.c
+++ b/exec.c
@@ -3538,6 +3538,7 @@ void *address_space_map(AddressSpace *as,
if (!memory_access_is_direct(mr, is_write)) {
if (atomic_xchg(&bounce.in_use, true)) {
+ *plen = 0;
return NULL;
}
/* Avoid unbounded allocations */
--
2.26.2
- [PATCH v3] exec: set map length to zero when returning NULL,
P J P <=