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05 April 2024, 19:05:47 UTC
Revision c37336b078ba9d2ff38c535b194996a7ad6e69f8 authored by Evgeniy Dushistov on 27 August 2006, 08:23:45 UTC, committed by Linus Torvalds on 27 August 2006, 18:01:31 UTC 
[PATCH] ufs: write to hole in big file
 
On UFS, this scenario:
	open(O_TRUNC)
	lseek(1024 * 1024 * 80)
	write("A")
	lseek(1024 * 2)
	write("A")

may cause access to invalid address.

This happened because of "goal" is calculated in wrong way in block
allocation path, as I see this problem exists also in 2.4.

We use construction like this i_data[lastfrag], i_data array of pointers to
direct blocks, indirect and so on, it has ceratain size ~20 elements, and
lastfrag may have value for example 40000.

Also this patch fixes related to handling such scenario issues, wrong
zeroing metadata, in case of block(not fragment) allocation, and wrong goal
calculation, when we allocate block

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent 08fb306
History
Tip revision: c37336b078ba9d2ff38c535b194996a7ad6e69f8 authored by Evgeniy Dushistov on 27 August 2006, 08:23:45 UTC
[PATCH] ufs: write to hole in big file
Tip revision: c37336b
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