diff options
| -rw-r--r-- | lib/libc/stdlib/reallocf.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/libc/stdlib/reallocf.c b/lib/libc/stdlib/reallocf.c index 5320926..a85b5a3 100644 --- a/lib/libc/stdlib/reallocf.c +++ b/lib/libc/stdlib/reallocf.c @@ -35,7 +35,14 @@ reallocf(void *ptr, size_t size) void *nptr; nptr = realloc(ptr, size); - if (!nptr && ptr) + + /* + * When the System V compatibility option (malloc "V" flag) is + * in effect, realloc(ptr, 0) frees the memory and returns NULL. + * So, to avoid double free, call free() only when size != 0. + * realloc(ptr, 0) can't fail when ptr != NULL. + */ + if (!nptr && ptr && size != 0) free(ptr); return (nptr); } |
