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terminal/grdev: simplify DRM event parsing

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Coverity complained about this code and is partially right. We are not
really protected against integer overflows. Sure, unlikely, but lets just
avoid any overflows and properly protect our parser loop.
This commit is contained in:
David Herrmann 2014-10-02 17:09:05 +02:00
parent f1f5b2a3bd
commit 6a15ce2b3e
1 changed files with 5 additions and 7 deletions
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12
src/libsystemd-terminal/grdev-drm.c
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@ -2195,7 +2195,8 @@ static int grdrm_card_io_fn(sd_event_source *s, int fd, uint32_t revents, void *
uint32_t id, counter;
grdrm_object *object;
char buf[4096];
ssize_t l, i;
size_t len;
ssize_t l;
if (revents & (EPOLLHUP | EPOLLERR)) {
/* Immediately close device on HUP; no need to flush pending
@ -2214,15 +2215,12 @@ static int grdrm_card_io_fn(sd_event_source *s, int fd, uint32_t revents, void *
log_debug("grdrm: %s/%s: read error: %m", card->base.session->name, card->base.name);
grdrm_card_close(card);
return 0;
} else if ((size_t)l < sizeof(*event)) {
log_debug("grdrm: %s/%s: short read of %zd bytes", card->base.session->name, card->base.name, l);
return 0;
}
for (i = 0; i < l; i += event->length) {
event = (void*)&buf[i];
for (len = l; len > 0; len -= event->length) {
event = (void*)buf;
if (i + (ssize_t)sizeof(*event) > l || i + (ssize_t)event->length > l) {
if (len < sizeof(*event) || len < event->length) {
log_debug("grdrm: %s/%s: truncated event", card->base.session->name, card->base.name);
break;
}