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-rw-r--r--lib/stdlib/src/erl_tar.erl14
-rw-r--r--lib/stdlib/test/tar_SUITE.erl1
2 files changed, 12 insertions, 3 deletions
diff --git a/lib/stdlib/src/erl_tar.erl b/lib/stdlib/src/erl_tar.erl
index 89b4ea6c04..acf7a5cd40 100644
--- a/lib/stdlib/src/erl_tar.erl
+++ b/lib/stdlib/src/erl_tar.erl
@@ -397,9 +397,17 @@ to_string(Str0, Count) ->
pad_file(File) ->
{ok,Position} = file:position(File, {cur,0}),
- %% There must be at least one empty record at the end of the file.
- Zeros = zeroes(?block_size - (Position rem ?block_size)),
- file:write(File, Zeros).
+ %% There must be at least two zero records at the end.
+ Fill = case ?block_size - (Position rem ?block_size) of
+ Fill0 when Fill0 < 2*?record_size ->
+ %% We need to another block here to ensure that there
+ %% are at least two zero records at the end.
+ Fill0 + ?block_size;
+ Fill0 ->
+ %% Large enough.
+ Fill0
+ end,
+ file:write(File, zeroes(Fill)).
split_filename(Name) when length(Name) =< ?th_name_len ->
{"", Name};
diff --git a/lib/stdlib/test/tar_SUITE.erl b/lib/stdlib/test/tar_SUITE.erl
index 297f5b161a..6349139925 100644
--- a/lib/stdlib/test/tar_SUITE.erl
+++ b/lib/stdlib/test/tar_SUITE.erl
@@ -73,6 +73,7 @@ borderline(Config) when is_list(Config) ->
?line lists:foreach(fun(Size) -> borderline_test(Size, TempDir) end,
[0, 1, 10, 13, 127, 333, Record-1, Record, Record+1,
+ Block-2*Record-1, Block-2*Record, Block-2*Record+1,
Block-Record-1, Block-Record, Block-Record+1,
Block-1, Block, Block+1,
Block+Record-1, Block+Record, Block+Record+1]),