Extended header entries contain a length value that is a bit tricky to calculate because it includes its own length (number of decimal digits) as well. We get it wrong in corner cases. Add a check, report wrong results as a warning and add a test for exercising it.
Signed-off-by: René Scharfe <[email protected]> --- archive-tar.c | 6 ++++++ t/t5004-archive-corner-cases.sh | 20 ++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/archive-tar.c b/archive-tar.c index 3e53aac1e6..355c8142c6 100644 --- a/archive-tar.c +++ b/archive-tar.c @@ -144,6 +144,7 @@ static int stream_blocked(const struct object_id *oid) static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword, const char *value, unsigned int valuelen) { + size_t orig_len = sb->len; int len, tmp; /* "%u %s=%s\n" */ @@ -155,6 +156,11 @@ static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword, strbuf_addf(sb, "%u %s=", len, keyword); strbuf_add(sb, value, valuelen); strbuf_addch(sb, '\n'); + + if (len != sb->len - orig_len) + warning("pax extended header length miscalculated as %d" + ", should be %"PRIuMAX, + len, (uintmax_t)(sb->len - orig_len)); } /* diff --git a/t/t5004-archive-corner-cases.sh b/t/t5004-archive-corner-cases.sh index 271eb5a1fd..2f15d1899d 100755 --- a/t/t5004-archive-corner-cases.sh +++ b/t/t5004-archive-corner-cases.sh @@ -204,4 +204,24 @@ test_expect_success EXPENSIVE,LONG_IS_64BIT,UNZIP,UNZIP_ZIP64_SUPPORT,ZIPINFO \ grep $size big.lst ' +build_tree() { + perl -e ' + my $hash = $ARGV[0]; + foreach my $order (2..6) { + $first = 10 ** $order; + foreach my $i (-13..-9) { + my $name = "a" x ($first + $i); + print "100644 blob $hash\t$name\n" + } + } + ' "$1" +} + +test_expect_failure 'tar archive with long paths' ' + blob=$(echo foo | git hash-object -w --stdin) && + tree=$(build_tree $blob | git mktree) && + git archive -o long_paths.tar $tree 2>stderr && + test_must_be_empty stderr +' + test_done -- 2.23.0
