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login: fix pos-array allocation

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GREEDY_REALLOC takes a pointer to the real size, not the array-width as
argument. Therefore, our array is currently way to small to keep the seat
positions.

Introduce GREEDY_REALLOC0_T() as typed version of GREEDY_REALLOC and store
the array-width instead of array-size.
This commit is contained in:
David Herrmann 2014-02-25 12:20:25 +01:00
parent 23fae27185
commit a1937e679f
2 changed files with 10 additions and 1 deletions
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2
src/login/logind-seat.c
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@ -475,7 +475,7 @@ void seat_claim_position(Seat *s, Session *session, unsigned int pos) {
if (seat_has_vts(s))
pos = session->vtnr;
if (!GREEDY_REALLOC0(s->positions, s->position_count, pos + 1))
if (!GREEDY_REALLOC0_T(s->positions, s->position_count, pos + 1))
return;
seat_evict_position(s, session);

9
src/shared/util.h
View File

@ -723,6 +723,15 @@ void* greedy_realloc0(void **p, size_t *allocated, size_t need);
#define GREEDY_REALLOC0(array, allocated, need) \
greedy_realloc0((void**) &(array), &(allocated), sizeof((array)[0]) * (need))
#define GREEDY_REALLOC0_T(array, count, need) \
({ \
size_t _size = (count) * sizeof((array)[0]); \
void *_ptr = GREEDY_REALLOC0((array), _size, (need)); \
if (_ptr) \
(count) = _size / sizeof((array)[0]); \
_ptr; \
})
static inline void _reset_errno_(int *saved_errno) {
errno = *saved_errno;
}