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Fix unsafe usage of strerror(errno) within ereport().

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This is the converse of the unsafe-usage-of-%m problem: the reason
ereport/elog provide that format code is mainly to dodge the hazard
of errno getting changed before control reaches functions within the
arguments of the macro.  I only found one instance of this hazard,
but it's been there since 9.4 :-(.
This commit is contained in:
Tom Lane 2018-05-21 00:32:28 -04:00
parent fa2cfb962c
commit 28782d7e3b
1 changed files with 3 additions and 1 deletions
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4
src/backend/libpq/auth.c
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@ -2017,10 +2017,12 @@ auth_peer(hbaPort *port)
pw = getpwuid(uid);
if (!pw)
{
int save_errno = errno;
ereport(LOG,
(errmsg("could not look up local user ID %ld: %s",
(long) uid,
errno ? strerror(errno) : _("user does not exist"))));
save_errno ? strerror(save_errno) : _("user does not exist"))));
return STATUS_ERROR;
}