[PATCH 5/8] libctf: don't dereference out-of-bounds locations in the qualifier hashtab

[Nick Alcock <nick.alcock@oracle.com>]

isqualifier, which is used by ctf_lookup_by_name to figure out if a
given word in a type name is a qualifier, takes the address of a
possibly out-of-bounds location before checking its bounds.

In any reasonable compiler this will just lead to a harmless address
computation that is then discarded if out-of-bounds, but it's still
undefined behaviour and the sanitizer rightly complains.

libctf/ChangeLog
2021-03-23  Nick Alcock  <nick.alcock@oracle.com>

	PR libctf/27628
	* ctf-lookup.c (isqualifier): Don't dereference out-of-bounds
	qhash values.
---
 libctf/ctf-lookup.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libctf/ctf-lookup.c b/libctf/ctf-lookup.c
index 9d1e6d8a4a2..e50c868c5b8 100644
--- a/libctf/ctf-lookup.c
+++ b/libctf/ctf-lookup.c
@@ -111,10 +111,13 @@ isqualifier (const char *s, size_t len)
   };
 
   int h = s[len - 1] + (int) len - 105;
+
+  if (h < 0 || (size_t) h >= sizeof (qhash) / sizeof (qhash[0]))
+    return 0;
+
   const struct qual *qp = &qhash[h];
 
-  return (h >= 0 && (size_t) h < sizeof (qhash) / sizeof (qhash[0])
-	  && (size_t) len == qp->q_len &&
+  return ((size_t) len == qp->q_len &&
 	  strncmp (qp->q_name, s, qp->q_len) == 0);
 }
 
-- 
2.31.0.253.gdec51257f3