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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 21:45:25 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 21:45:25 +0100 |
| commit | d05c5f7ba164aed3db02fb188c26d0dd94f5455b (patch) | |
| tree | 1f31fa0312d525122ac601a321236d9d1cb695d2 /lib/locking-selftest-rlock-hardirq.h | |
| parent | Merge tag 'acpi-urgent-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel... (diff) | |
| download | linux-d05c5f7ba164aed3db02fb188c26d0dd94f5455b.tar.xz linux-d05c5f7ba164aed3db02fb188c26d0dd94f5455b.zip | |
vfs,mm: fix return value of read() at s_maxbytes
We truncated the possible read iterator to s_maxbytes in commit
c2a9737f45e2 ("vfs,mm: fix a dead loop in truncate_inode_pages_range()"),
but our end condition handling was wrong: it's not an error to try to
read at the end of the file.
Reading past the end should return EOF (0), not EINVAL.
See for example
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1649342
http://lists.gnu.org/archive/html/bug-coreutils/2016-12/msg00008.html
where a md5sum of a maximally sized file fails because the final read is
exactly at s_maxbytes.
Fixes: c2a9737f45e2 ("vfs,mm: fix a dead loop in truncate_inode_pages_range()")
Reported-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Cc: Wei Fang <fangwei1@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/locking-selftest-rlock-hardirq.h')
0 files changed, 0 insertions, 0 deletions