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authorDavid Herrmann <dh.herrmann@gmail.com>2014-06-13 18:43:22 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2014-06-16 15:23:06 +0200
commit9489490a693ec5d1e3b49eecedb0ca5511568665 (patch)
tree9985e44026281d04a90a2c865947844119ca68d9
parent368504f485d09b9fd48b7538e71981f648eb32bb (diff)
util: add realloc_multiply() helper
This is similar to malloc_multiply() and friends. It is realloc() with a multiplication-overflow check.
-rw-r--r--src/shared/util.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/shared/util.h b/src/shared/util.h
index 5a2f10387e..8ddd1a5daf 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -672,6 +672,13 @@ _malloc_ _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b)
return malloc(a * b);
}
+_alloc_(2, 3) static inline void *realloc_multiply(void *p, size_t a, size_t b) {
+ if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
+ return NULL;
+
+ return realloc(p, a * b);
+}
+
_alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
return NULL;