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authorOndřej Bílka <neleai@seznam.cz>2013-10-20 08:25:25 +0200
committerOndřej Bílka <neleai@seznam.cz>2013-10-20 08:26:05 +0200
commit45c30c61c9001867c1891f5862764f084e53f348 (patch)
treec0455f7bbf57ef230ce6dad3c448bb8ae55bed9b /time
parent3d7dc513b782407bd397b13771a631d9080d3aac (diff)
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Replace alloca in __tzfile_read by malloc. Fixes bug 15670
Diffstat (limited to 'time')
-rw-r--r--time/tzfile.c26
1 files changed, 8 insertions, 18 deletions
diff --git a/time/tzfile.c b/time/tzfile.c
index 9dd5130..3ea3051 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -114,6 +114,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
int was_using_tzfile = __use_tzfile;
int trans_width = 4;
size_t tzspec_len;
+ char *new = NULL;
if (sizeof (time_t) != 4 && sizeof (time_t) != 8)
abort ();
@@ -145,22 +146,12 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
if (*file != '/')
{
const char *tzdir;
- unsigned int len, tzdir_len;
- char *new, *tmp;
tzdir = getenv ("TZDIR");
if (tzdir == NULL || *tzdir == '\0')
- {
- tzdir = default_tzdir;
- tzdir_len = sizeof (default_tzdir) - 1;
- }
- else
- tzdir_len = strlen (tzdir);
- len = strlen (file) + 1;
- new = (char *) __alloca (tzdir_len + 1 + len);
- tmp = __mempcpy (new, tzdir, tzdir_len);
- *tmp++ = '/';
- memcpy (tmp, file, len);
+ tzdir = default_tzdir;
+ if (__asprintf (&new, "%s/%s", tzdir, file) == -1)
+ goto ret_free_transitions;
file = new;
}
@@ -170,11 +161,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
&& stat64 (file, &st) == 0
&& tzfile_ino == st.st_ino && tzfile_dev == st.st_dev
&& tzfile_mtime == st.st_mtime)
- {
- /* Nothing to do. */
- __use_tzfile = 1;
- return;
- }
+ goto done; /* Nothing to do. */
/* Note the file is opened with cancellation in the I/O functions
disabled and if available FD_CLOEXEC set. */
@@ -527,12 +514,15 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
__daylight = rule_stdoff != rule_dstoff;
__timezone = -rule_stdoff;
+ done:
__use_tzfile = 1;
+ free (new);
return;
lose:
fclose (f);
ret_free_transitions:
+ free (new);
free ((void *) transitions);
transitions = NULL;
}