util: fix overflow checks

[elogind.git] / src / shared / util.h

diff --git a/src/shared/util.h b/src/shared/util.h
index 2e49cfde2efda507b6546929387e129b3b15b409..e1d4735ee38dec94278118343fd89d6b0cba6e69 100644 (file)
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -545,14 +545,14 @@ void closedirp(DIR **d);
 void umaskp(mode_t *u);
 
 _malloc_  static inline void *malloc_multiply(size_t a, size_t b) {
-        if (_unlikely_(a > ((size_t) -1) / b))
+        if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
                 return NULL;
 
         return malloc(a * b);
 }
 
 _malloc_ static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
-        if (_unlikely_(a > ((size_t) -1) / b))
+        if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
                 return NULL;
 
         return memdup(p, a * b);