pgsql-server/src/backend/commands Tag: REL7_4_ ...

CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@svr1.postgresql.org    04/01/17 22:15:58

Modified files:
    src/backend/commands: Tag: REL7_4_STABLE copy.c

Log message:
    Don't use %s-with-precision format spec to truncate data being displayed
    in a COPY error message.  It seems that glibc gets indigestion if it is
    asked to truncate strings that contain invalid UTF-8 encoding sequences.
    vsnprintf will return -1 in such cases, leading to looping and eventual
    memory overflow in elog.c.  Instead use our own, more robust pg_mbcliplen
    routine.  I believe this problem accounts for several recent reports of
    unexpected 'out of memory' errors during COPY IN.