[Xen-changelog] [xen staging] rangeset: make inquiry functions tolerate NULL inputs

[patchbot@xxxxxxx]

commit ad0a9f273d6d6f0545cd9b708b2d4be581a6cadd
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Aug 17 13:54:40 2018 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Aug 17 13:54:40 2018 +0200

    rangeset: make inquiry functions tolerate NULL inputs
    
    Rather than special casing the ->iomem_caps check in x86's
    get_page_from_l1e() for the dom_xen case, let's be more tolerant in
    general, along the lines of rangeset_is_empty(): A never allocated
    rangeset can't possibly contain or overlap any range.
    
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/common/rangeset.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/common/rangeset.c b/xen/common/rangeset.c
index bb68ce62e4..7788cdd241 100644
--- a/xen/common/rangeset.c
+++ b/xen/common/rangeset.c
@@ -256,6 +256,9 @@ bool_t rangeset_contains_range(
 
     ASSERT(s <= e);
 
+    if ( !r )
+        return false;
+
     read_lock(&r->lock);
     x = find_range(r, s);
     contains = (x && (x->e >= e));
@@ -272,6 +275,9 @@ bool_t rangeset_overlaps_range(
 
     ASSERT(s <= e);
 
+    if ( !r )
+        return false;
+
     read_lock(&r->lock);
     x = find_range(r, e);
     overlaps = (x && (s <= x->e));
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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