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Use snprintf not sprintf in pg_waldump's timestamptz_to_str.

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This could only cause an issue if strftime returned a ridiculously
long timezone name, which seems unlikely; and it wouldn't qualify
as a security problem even then, since pg_waldump (nee pg_xlogdump)
is a debug tool not part of the server.  But gcc 8 has started issuing
warnings about it, so let's use snprintf and be safe.

Backpatch to 9.3 where this code was added.

Discussion: https://postgr.es/m/21789.1529170195@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2018-06-16 14:45:47 -04:00
parent 9b9b622b2a
commit 3243cbc085
1 changed files with 4 additions and 2 deletions
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6
contrib/pg_xlogdump/compat.c
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@ -64,9 +64,11 @@ timestamptz_to_str(TimestampTz dt)
strftime(zone, sizeof(zone), "%Z", ltime);
#ifdef HAVE_INT64_TIMESTAMP
sprintf(buf, "%s.%06d %s", ts, (int) (dt % USECS_PER_SEC), zone);
snprintf(buf, sizeof(buf),
"%s.%06d %s", ts, (int) (dt % USECS_PER_SEC), zone);
#else
sprintf(buf, "%s.%.6f %s", ts, fabs(dt - floor(dt)), zone);
snprintf(buf, sizeof(buf),
"%s.%.6f %s", ts, fabs(dt - floor(dt)), zone);
#endif
return buf;