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logind: check return value from lseek

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In practice this doesn't matter much because the read that follows will
likely fail, but we'll get a better error message.

CID #1368233.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2017-02-19 13:43:22 -05:00
parent df8067ef6d
commit e8f3e7a707
1 changed files with 4 additions and 5 deletions
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9
src/login/logind-seat.c
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@ -379,7 +379,8 @@ int seat_read_active_vt(Seat *s) {
if (!seat_has_vts(s))
return 0;
lseek(s->manager->console_active_fd, SEEK_SET, 0);
if (lseek(s->manager->console_active_fd, SEEK_SET, 0) < 0)
return log_error_errno(errno, "lseek on console_active_fd failed: %m");
k = read(s->manager->console_active_fd, t, sizeof(t)-1);
if (k <= 0) {
@ -396,10 +397,8 @@ int seat_read_active_vt(Seat *s) {
}
r = safe_atou(t+3, &vtnr);
if (r < 0) {
log_error("Failed to parse VT number %s", t+3);
return r;
}
if (r < 0)
return log_error_errno(r, "Failed to parse VT number \"%s\": %m", t+3);
if (!vtnr) {
log_error("VT number invalid: %s", t+3);