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[PATCH] Fix count-delta overcounting

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The count-delta routine sometimes overcounted the copied source
material which resulted in unsigned int wraparound.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Junio C Hamano 2005-05-28 12:22:38 -07:00 committed by Linus Torvalds
parent 844e6e4d58
commit 8b7d510fb1
1 changed files with 3 additions and 0 deletions
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count-delta.c
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@ -88,5 +88,8 @@ unsigned long count_delta(void *delta_buf, unsigned long delta_size)
/* delete size is what was _not_ copied from source. /* delete size is what was _not_ copied from source.
* edit size is that and literal additions. * edit size is that and literal additions.
*/ */
if (src_size + added_literal < copied_from_source)
/* we ended up overcounting and underflowed */
return 0;
return (src_size - copied_from_source) + added_literal; return (src_size - copied_from_source) + added_literal;
} }