OE modifications to the original patch: * Removed NEWS hunk to apply on vanilla 7.2 coreutils >From 570beb56f58bb087a614af885bec7e9cf6b19423 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Wed, 22 Apr 2009 08:45:27 +0200 Subject: [PATCH] sort -m: don't segfault when output file is also an input = file * src/sort.c (avoid_trashing_input): Fix an off-by-one error and guard the use of memmove. * NEWS (Bug fixes): Mention it. * tests/misc/sort: Add tests to exercise the offending code. * THANKS: Update. Reported by Otavio Salvador in http://bugs.debian.org/525048. --- NEWS | 6 +++++- THANKS | 1 + src/sort.c | 10 ++++++---- tests/misc/sort | 17 ++++++++++++++++- 4 files changed, 28 insertions(+), 6 deletions(-) diff --git a/THANKS b/THANKS index fe523fe..876a6b6 100644 --- a/THANKS +++ b/THANKS @@ -435,6 +435,7 @@ Ole Laursen olau@hardworking.dk Oliver Kiddle okiddle@yahoo.co.uk Ørn E. Hansen oehansen@daimi.aau.dk Oskar Liljeblad osk@hem.passagen.se +Otavio Salvador otavio@ossystems.com.br Pádraig Brady P@draigBrady.com Patrick Mauritz oxygene@studentenbude.ath.cx Paul D. Smith psmith@gnu.org diff --git a/src/sort.c b/src/sort.c index 2e6ce87..f48d727 100644 --- a/src/sort.c +++ b/src/sort.c @@ -1,5 +1,5 @@ /* sort - sort lines of text (with all kinds of options). - Copyright (C) 1988, 1991-2008 Free Software Foundation, Inc. + Copyright (C) 1988, 1991-2009 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -2602,18 +2602,20 @@ avoid_trashing_input (struct sortfile *files, size_t ntemps, pid_t pid; char *temp = create_temp (&tftp, &pid); size_t num_merged = 0; - while (i + num_merged < nfiles) + do { num_merged += mergefiles (&files[i], 0, nfiles - i, tftp, temp); files[i].name = temp; files[i].pid = pid; - memmove(&files[i], &files[i + num_merged], - num_merged * sizeof *files); + if (i + num_merged < nfiles) + memmove(&files[i + 1], &files[i + num_merged], + num_merged * sizeof *files); ntemps += 1; nfiles -= num_merged - 1;; i += num_merged; } + while (i < nfiles); } } diff --git a/tests/misc/sort b/tests/misc/sort index 4f377df..a27f47a 100755 --- a/tests/misc/sort +++ b/tests/misc/sort @@ -1,6 +1,6 @@ #!/usr/bin/perl -# Copyright (C) 2008 Free Software Foundation, Inc. +# Copyright (C) 2008, 2009 Free Software Foundation, Inc. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by @@ -339,6 +339,21 @@ my @Tests = ["sort-numeric", '--sort=numeric', {IN=>".01\n0\n"}, {OUT=>"0\n.01\n"}], ["sort-gennum", '--sort=general-numeric', {IN=>"1e2\n2e1\n"}, {OUT=>"2e1\n1e2\n"}], + +# -m with output file also used as an input file +# In coreutils-7.2, this caused a segfault. +# This test looks a little strange. Here's why: +# since we're using "-o f", standard output will be empty, hence OUT=>'' +# We still want to ensure that the output file, "f" has expected contents, +# hence the added CMP=> directive. +["output-is-input", '-m -o f', {IN=> {f=> "a\n"}}, {OUT=>''}, + {CMP=> ["a\n", {'f'=> undef}]} ], +["output-is-input-2", '-m -o f', {OUT=>''}, + {IN=> {f=> "a\n"}}, {IN=> {g=> "b\n"}}, {IN=> {h=> "c\n"}}, + {CMP=> ["a\nb\nc\n", {'f'=> undef}]} ], +["output-is-input-3", '-m -o f', {OUT=>''}, + {IN=> {g=> "a\n"}}, {IN=> {h=> "b\n"}}, {IN=> {f=> "c\n"}}, + {CMP=> ["a\nb\nc\n", {'f'=> undef}]} ], ); # Add _POSIX2_VERSION=199209 to the environment of each test