| commit | aaae0bf787f09ba102f69c3cf85d37e6554ab9fd | [log] [tgz] |
|---|---|---|
| author | Allan Xavier <allan.x.xavier@oracle.com> | Thu Mar 02 17:29:02 2017 +0000 |
| committer | Junio C Hamano <gitster@pobox.com> | Fri Mar 03 11:16:20 2017 -0800 |
| tree | 16d8fb532ed7f5ade4b18711b94a7f75778237a2 | |
| parent | c3808ca6982b0ad7ee9b87eca9b50b9a24ec08b0 [diff] |
line-log.c: prevent crash during union of too many ranges The existing implementation of range_set_union does not correctly reallocate memory, leading to a heap overflow when it attempts to union more than 24 separate line ranges. For struct range_set *out to grow correctly it must have out->nr set to the current size of the buffer when it is passed to range_set_grow. However, the existing implementation of range_set_union only updates out->nr at the end of the function, meaning that it is always zero before this. This results in range_set_grow never growing the buffer, as well as some of the union logic itself being incorrect as !out->nr is always true. The reason why 24 is the limit is that the first allocation of size 1 ends up allocating a buffer of size 24 (due to the call to alloc_nr in ALLOC_GROW). This goes some way to explain why this hasn't been caught before. Fix the problem by correctly updating out->nr after reallocating the range_set. As this results in out->nr containing the same value as the variable o, replace o with out->nr as well. Finally, add a new test to help prevent the problem reoccurring in the future. Thanks to Vegard Nossum for writing the test. Signed-off-by: Allan Xavier <allan.x.xavier@oracle.com> Reviewed-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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