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util: make sure heap allocators fail when array allocations are out of bounds

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=858777
This commit is contained in:
Lennart Poettering 2012-09-20 00:02:01 +02:00
parent 505b6a61c2
commit 4b8772bf5f
1 changed files with 17 additions and 3 deletions
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20
src/shared/util.h
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@ -111,13 +111,13 @@ size_t page_size(void);
bool streq_ptr(const char *a, const char *b);
#define new(t, n) ((t*) malloc(sizeof(t)*(n)))
#define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
#define new0(t, n) ((t*) calloc((n), sizeof(t)))
#define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
#define newdup(t, p, n) ((t*) memdup(p, sizeof(t)*(n)))
#define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
#define malloc0(n) (calloc((n), 1))
@ -514,7 +514,7 @@ char *format_bytes(char *buf, size_t l, off_t t);
int fd_wait_for_event(int fd, int event, usec_t timeout);
void* memdup(const void *p, size_t l);
void* memdup(const void *p, size_t l) _malloc_;
int is_kernel_thread(pid_t pid);
@ -543,3 +543,17 @@ void fclosep(FILE **f);
void closep(int *fd);
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))
return NULL;
return malloc(a * b);
}
static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
if (_unlikely_(a > ((size_t) -1) / b))
return NULL;
return memdup(p, a * b);
}