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Add debugging output on memory alloc failure.

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Add missing checks in event_select.c for reallocarray() failure.
This commit is contained in:
Todd C. Miller
2015-06-05 13:18:48 -06:00
parent 564eb7e7dd
commit c0fa0e248d
2 changed files with 49 additions and 27 deletions
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16
lib/util/event.c
View File

@@ -88,14 +88,19 @@ sudo_ev_base_alloc_v1(void)
debug_decl(sudo_ev_base_alloc, SUDO_DEBUG_EVENT)
base = calloc(1, sizeof(*base));
if (base != NULL) {
if (base == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: unable to allocate base", __func__);
debug_return_ptr(NULL);
}
TAILQ_INIT(&base->events);
TAILQ_INIT(&base->timeouts);
if (sudo_ev_base_alloc_impl(base) != 0) {
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: unable to allocate impl base", __func__);
free(base);
base = NULL;
}
}
debug_return_ptr(base);
}
@@ -125,13 +130,16 @@ sudo_ev_alloc_v1(int fd, short events, sudo_ev_callback_t callback, void *closur
/* XXX - sanity check events value */
ev = calloc(1, sizeof(*ev));
if (ev != NULL) {
if (ev == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: unable to allocate event", __func__);
debug_return_ptr(NULL);
}
ev->fd = fd;
ev->events = events;
ev->pfd_idx = -1;
ev->callback = callback;
ev->closure = closure;
}
debug_return_ptr(ev);
}

42
lib/util/event_select.c
View File

@@ -68,10 +68,9 @@ sudo_ev_base_alloc_impl(struct sudo_event_base *base)
if (base->readfds_in == NULL || base->writefds_in == NULL ||
base->readfds_out == NULL || base->writefds_out == NULL) {
free(base->readfds_in);
free(base->writefds_in);
free(base->readfds_out);
free(base->writefds_out);
sudo_debug_printf(SUDO_DEBUG_WARN, "%s: unable to calloc(1, %zu)",
__func__, sizeof(fd_mask));
sudo_ev_base_free_impl(base);
debug_return_int(-1);
}
debug_return_int(0);
@@ -99,19 +98,34 @@ sudo_ev_add_impl(struct sudo_event_base *base, struct sudo_event *ev)
const int n = howmany(ev->fd + 1, NFDBITS);
const size_t used_bytes = o * sizeof(fd_mask);
const size_t new_bytes = (n - o) * sizeof(fd_mask);
fd_set *rfds_in, *wfds_in, *rfds_out, *wfds_out;
base->readfds_in = reallocarray(base->readfds_in, n, sizeof(fd_mask));
memset((char *)base->readfds_in + used_bytes, 0, new_bytes);
rfds_in = reallocarray(base->readfds_in, n, sizeof(fd_mask));
wfds_in = reallocarray(base->writefds_in, n, sizeof(fd_mask));
rfds_out = reallocarray(base->readfds_out, n, sizeof(fd_mask));
wfds_out = reallocarray(base->writefds_out, n, sizeof(fd_mask));
if (rfds_in == NULL || wfds_in == NULL ||
rfds_out == NULL || wfds_out == NULL) {
sudo_debug_printf(SUDO_DEBUG_WARN,
"%s: unable to reallocarray(%d, %zu)",
__func__, n, sizeof(fd_mask));
free(rfds_in);
free(wfds_in);
free(rfds_out);
debug_return_int(-1);
}
base->writefds_in = reallocarray(base->writefds_in, n, sizeof(fd_mask));
memset((char *)base->writefds_in + used_bytes, 0, new_bytes);
base->readfds_out = reallocarray(base->readfds_out, n, sizeof(fd_mask));
memset((char *)base->readfds_out + used_bytes, 0, new_bytes);
base->writefds_out = reallocarray(base->writefds_out, n, sizeof(fd_mask));
memset((char *)base->writefds_out + used_bytes, 0, new_bytes);
/* Clear newly allocated space. */
memset((char *)rfds_in + used_bytes, 0, new_bytes);
memset((char *)wfds_in + used_bytes, 0, new_bytes);
memset((char *)rfds_out + used_bytes, 0, new_bytes);
memset((char *)wfds_out + used_bytes, 0, new_bytes);
/* Update base. */
base->readfds_in = rfds_in;
base->writefds_in = wfds_in;
base->readfds_out = rfds_out;
base->writefds_out = wfds_out;
base->maxfd = (n * NFDBITS) - 1;
}