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Check lseek() return value.

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Coverity CID 104061.
This commit is contained in:
Todd C. Miller
2016-05-05 16:46:25 -06:00
parent 60e740dd60
commit 562b5cb59b
1 changed files with 15 additions and 5 deletions
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20
plugins/sudoers/timestamp.c
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@@ -125,7 +125,12 @@ ts_find_record(int fd, struct timestamp_entry *key, struct timestamp_entry *entr
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"wrong sized record, got %hu, expected %zu",
cur.size, sizeof(cur));
lseek(fd, (off_t)cur.size - (off_t)sizeof(cur), SEEK_CUR);
if (lseek(fd, (off_t)cur.size - (off_t)sizeof(cur), SEEK_CUR) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"unable to seek forward %lld",
(off_t)cur.size - (off_t)sizeof(cur));
break;
}
if (cur.size == 0)
break; /* size must be non-zero */
continue;
@@ -632,7 +637,11 @@ timestamp_lock(void *vcookie, struct passwd *pw)
cookie->locked = false;
cookie->key.type = TS_GLOBAL; /* find a non-tty record */
(void)lseek(cookie->fd, 0, SEEK_SET);
if (lseek(cookie->fd, 0, SEEK_SET) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"unable to rewind fd");
debug_return_bool(false);
}
if (ts_find_record(cookie->fd, &cookie->key, &entry)) {
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"found existing global record");
@@ -873,9 +882,10 @@ timestamp_remove(bool unlink_it)
/* Back up and disable the entry. */
if (!ISSET(entry.flags, TS_DISABLED)) {
SET(entry.flags, TS_DISABLED);
lseek(fd, 0 - (off_t)sizeof(entry), SEEK_CUR);
if (ts_write(fd, fname, &entry, -1) == -1)
rval = false;
if (lseek(fd, 0 - (off_t)sizeof(entry), SEEK_CUR) != -1) {
if (ts_write(fd, fname, &entry, -1) == -1)
rval = false;
}
}
}