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Commit28782d7

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Fix unsafe usage of strerror(errno) within ereport().
This is the converse of the unsafe-usage-of-%m problem: the reasonereport/elog provide that format code is mainly to dodge the hazardof errno getting changed before control reaches functions within thearguments of the macro. I only found one instance of this hazard,but it's been there since 9.4 :-(.
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‎src/backend/libpq/auth.c

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2017,10 +2017,12 @@ auth_peer(hbaPort *port)
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pw=getpwuid(uid);
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if (!pw)
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{
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intsave_errno=errno;
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ereport(LOG,
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(errmsg("could not look up local user ID %ld: %s",
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(long)uid,
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errno ?strerror(errno) :_("user does not exist"))));
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save_errno ?strerror(save_errno) :_("user does not exist"))));
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returnSTATUS_ERROR;
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}
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