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pack: don't allow a negative offset

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This commit is contained in:
Carlos Martín Nieto 2016-02-25 15:46:59 +01:00
parent ea9e00cb5c
commit 6d97beb91f
1 changed files with 5 additions and 0 deletions
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5
src/pack.c
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@ -365,9 +365,14 @@ static unsigned char *pack_window_open(
* pointless to ask for an offset into the middle of that
* hash, and the pack_window_contains function above wouldn't match
* don't allow an offset too close to the end of the file.
*
* Don't allow a negative offset, as that means we've wrapped
* around.
*/
if (offset > (p->mwf.size - 20))
return NULL;
if (offset < 0)
return NULL;
return git_mwindow_open(&p->mwf, w_cursor, offset, 20, left);
}