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vcs-svn: cap number of bytes read from sliding view

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Introduce a "max_off" field in struct sliding_view, roughly
representing a maximum number of bytes that can be read from "file".
If it is set to a nonnegative integer, a call to move_window()
attempting to put the right endpoint beyond that offset will return
an error instead.

The idea is to use this when applying Subversion-format deltas to
prevent reads past the end of the preimage (which has known length).
Without such a check, corrupt deltas would cause svn-fe to block
indefinitely when data in the input pipe is exhausted.

Inspired-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
This commit is contained in:
Jonathan Nieder
2011-05-27 04:07:44 -05:00
parent b747e5675d
commit fbdd4f6fb4
3 changed files with 5 additions and 2 deletions
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2
test-svn-fe.c
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@ -15,7 +15,7 @@ static int apply_delta(int argc, char *argv[])
{
struct line_buffer preimage = LINE_BUFFER_INIT;
struct line_buffer delta = LINE_BUFFER_INIT;
struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage);
struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage, -1);
if (argc != 5)
usage(test_svnfe_usage);