fuse: Don't access pipe->buffers without pipe_lock()

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commit a2477b0e67 upstream.

fuse_dev_splice_write() reads pipe->buffers to determine the size of
'bufs' array before taking the pipe_lock(). This is not safe as
another thread might change the 'pipe->buffers' between the allocation
and taking the pipe_lock(). So we end up with too small 'bufs' array.

Move the bufs allocations inside pipe_lock()/pipe_unlock() to fix this.

Fixes: dd3bb14f44 ("fuse: support splice() writing to fuse device")
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Andrey Ryabinin 2018-07-17 19:00:33 +03:00 • committed by Ben Hutchings

parent 84dd9744f4

commit 2d74743c19

1 changed files with 5 additions and 2 deletions

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fs/fuse/dev.c

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