diff options
Diffstat (limited to 'src/shared/time-dst.c')
| -rw-r--r-- | src/shared/time-dst.c | 69 |
1 files changed, 30 insertions, 39 deletions
diff --git a/src/shared/time-dst.c b/src/shared/time-dst.c index afc893cccc..3950a882bf 100644 --- a/src/shared/time-dst.c +++ b/src/shared/time-dst.c @@ -38,6 +38,7 @@ #include <sys/stat.h> #include "time-dst.h" +#include "util.h" /* * If tzh_version is '2' or greater, the above is followed by a second instance @@ -84,15 +85,12 @@ static inline int64_t decode64(const void *ptr) { int time_get_dst(time_t date, const char *tzfile, time_t *switch_cur, char **zone_cur, bool *dst_cur, time_t *switch_next, int *delta_next, char **zone_next, bool *dst_next) { - time_t *transitions = NULL; - size_t num_transitions = 0; unsigned char *type_idxs = 0; size_t num_types = 0; struct ttinfo *types = NULL; char *zone_names = NULL; struct stat st; size_t num_isstd, num_isgmt; - FILE *f; struct tzhead tzhead; size_t chars; size_t i; @@ -102,22 +100,21 @@ int time_get_dst(time_t date, const char *tzfile, size_t tzspec_len; size_t num_leaps; size_t lo, hi; - int err = -EINVAL; + size_t num_transitions = 0; + _cleanup_free_ time_t *transitions = NULL; + _cleanup_fclose_ FILE *f; f = fopen(tzfile, "re"); if (f == NULL) return -errno; - if (fstat(fileno(f), &st) < 0) { - err = -errno; - fclose(f); - return err; - } + if (fstat(fileno(f), &st) < 0) + return -errno; read_again: if (fread((void *)&tzhead, sizeof(tzhead), 1, f) != 1 || memcmp(tzhead.tzh_magic, TZ_MAGIC, sizeof(tzhead.tzh_magic)) != 0) - goto lose; + return -EINVAL; num_transitions = (size_t)decode(tzhead.tzh_timecnt); num_types = (size_t)decode(tzhead.tzh_typecnt); @@ -139,31 +136,31 @@ read_again: + chars + num_leaps * 8 + num_isstd + num_isgmt); if (fseek(f, to_skip, SEEK_CUR) != 0) - goto lose; + return -EINVAL; goto read_again; } if (num_transitions > ((SIZE_MAX - (__alignof__(struct ttinfo) - 1)) / (sizeof(time_t) + 1))) - goto lose; + return -EINVAL; total_size = num_transitions * (sizeof(time_t) + 1); total_size = ((total_size + __alignof__(struct ttinfo) - 1) & ~(__alignof__(struct ttinfo) - 1)); types_idx = total_size; if (num_leaps > (SIZE_MAX - total_size) / sizeof(struct ttinfo)) - goto lose; + return -EINVAL; total_size += num_types * sizeof(struct ttinfo); if (chars > SIZE_MAX - total_size) - goto lose; + return -EINVAL; total_size += chars; if (__alignof__(struct leap) - 1 > SIZE_MAX - total_size) - goto lose; + return -EINVAL; total_size = ((total_size + __alignof__(struct leap) - 1) & ~(__alignof__(struct leap) - 1)); if (num_leaps > (SIZE_MAX - total_size) / sizeof(struct leap)) - goto lose; + return -EINVAL; total_size += num_leaps * sizeof(struct leap); tzspec_len = 0; @@ -171,24 +168,24 @@ read_again: off_t rem = st.st_size - ftello(f); if (rem < 0 || (size_t) rem < (num_transitions * (8 + 1) + num_types * 6 + chars)) - goto lose; + return -EINVAL; tzspec_len = (size_t) rem - (num_transitions * (8 + 1) + num_types * 6 + chars); if (num_leaps > SIZE_MAX / 12 || tzspec_len < num_leaps * 12) - goto lose; + return -EINVAL; tzspec_len -= num_leaps * 12; if (tzspec_len < num_isstd) - goto lose; + return -EINVAL; tzspec_len -= num_isstd; if (tzspec_len == 0 || tzspec_len - 1 < num_isgmt) - goto lose; + return -EINVAL; tzspec_len -= num_isgmt + 1; if (SIZE_MAX - total_size < tzspec_len) - goto lose; + return -EINVAL; } transitions = (time_t *)calloc(total_size + tzspec_len, 1); if (transitions == NULL) - goto lose; + return -EINVAL; type_idxs = (unsigned char *)transitions + (num_transitions * sizeof(time_t)); @@ -197,18 +194,18 @@ read_again: if (sizeof(time_t) == 4 || trans_width == 8) { if (fread(transitions, trans_width + 1, num_transitions, f) != num_transitions) - goto lose; + return -EINVAL; } else { if (fread(transitions, 4, num_transitions, f) != num_transitions || fread(type_idxs, 1, num_transitions, f) != num_transitions) - goto lose; + return -EINVAL; } /* Check for bogus indices in the data file, so we can hereafter safely use type_idxs[T] as indices into `types' and never crash. */ for (i = 0; i < num_transitions; ++i) if (type_idxs[i] >= num_types) - goto lose; + return -EINVAL; if ((BYTE_ORDER != BIG_ENDIAN && (sizeof(time_t) == 4 || trans_width == 4)) || (BYTE_ORDER == BIG_ENDIAN && sizeof(time_t) == 8 && trans_width == 4)) { @@ -231,26 +228,26 @@ read_again: int c; if (fread(x, 1, sizeof(x), f) != sizeof(x)) - goto lose; + return -EINVAL; c = getc(f); if ((unsigned int)c > 1u) - goto lose; + return -EINVAL; types[i].isdst = c; c = getc(f); if ((size_t) c > chars) /* Bogus index in data file. */ - goto lose; + return -EINVAL; types[i].idx = c; types[i].offset = (long int)decode(x); } if (fread(zone_names, 1, chars, f) != chars) - goto lose; + return -EINVAL; for (i = 0; i < num_isstd; ++i) { int c = getc(f); if (c == EOF) - goto lose; + return -EINVAL; types[i].isstd = c != 0; } @@ -260,7 +257,7 @@ read_again: for (i = 0; i < num_isgmt; ++i) { int c = getc(f); if (c == EOF) - goto lose; + return -EINVAL; types[i].isgmt = c != 0; } @@ -268,10 +265,10 @@ read_again: types[i++].isgmt = 0; if (num_transitions == 0) - goto lose; + return -EINVAL; if (date < transitions[0] || date >= transitions[num_transitions - 1]) - goto lose; + return -EINVAL; /* Find the first transition after TIMER, and then pick the type of the transition before it. */ @@ -331,11 +328,5 @@ found: if (dst_next) *dst_next = types[type_idxs[i]].isdst; - free(transitions); - fclose(f); return 0; -lose: - free(transitions); - fclose(f); - return err; } |