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direct-io: fix error-path crashes

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Need to initialize map_bh.b_state to zero.  Otherwise, in case of a faulty
user-buffer its possible to go into dio_zero_block() and submit a page by
mistake - since it checks for buffer_new().

http://marc.info/?l=linux-kernel&m=118551339032528&w=2

akpm: Linus had a (better) patch to just do a kzalloc() in there, but it got
lost.  Probably this version is better for -stable anwyay.

Signed-off-by: Badari Pulavarty <[email protected]>
Acked-by: Joe Jin <[email protected]>
Acked-by: Zach Brown <[email protected]>
Cc: gurudas pai <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Badari Pulavarty 2007-08-10 13:00:44 -07:00 • committed by Linus Torvalds
commit 6a648fa721
1 changed files with 1 additions and 0 deletions
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fs/direct-io.c
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@ -974,6 +974,7 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
dio->get_block = get_block;
dio->end_io = end_io;
dio->map_bh.b_private = NULL;
dio->map_bh.b_state = 0;
dio->final_block_in_bio = -1;
dio->next_block_for_io = -1;