PWN-Hunter/android_kernel_xiaomi_sdm845
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NeilBrown <neilb@suse.de>

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The do_loop_readv_writev implementation of readv breaks out of the loop as
soon as a single read request didn't fill it's buffer:

		if (nr != len)
			break;

The generic_file_aio_read version doesn't.  So if it hits EOF before the end
of the list of buffers, it will try again on the next buffer.  If the file was
extended in the mean time, this will produce a bad result.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
akpm@linux-foundation.org 2007-07-15 23:38:25 -07:00 committed by Linus Torvalds
parent 5ed44a401d
commit c44939ecb6
1 changed files with 2 additions and 0 deletions
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mm/filemap.c
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@ -1219,6 +1219,8 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
retval = retval ?: desc.error;
break;
}
if (desc.count > 0)
break;
}
}
out: