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authorLukas Czerner <lczerner@redhat.com>2018-11-09 14:51:46 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2018-11-09 15:52:17 +0100
commitebacb81273599555a7a19f7754a1451206a5fc4f (patch)
treedd4ec65102426360a2b5b89552885f318ac5d302 /fs
parent2d84a2d19b6150c6dbac1e6ebad9c82e4c123772 (diff)
downloadlinux-ebacb81273599555a7a19f7754a1451206a5fc4f.tar.bz2
fuse: fix use-after-free in fuse_direct_IO()
In async IO blocking case the additional reference to the io is taken for it to survive fuse_aio_complete(). In non blocking case this additional reference is not needed, however we still reference io to figure out whether to wait for completion or not. This is wrong and will lead to use-after-free. Fix it by storing blocking information in separate variable. This was spotted by KASAN when running generic/208 fstest. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Reported-by: Zorro Lang <zlang@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: 744742d692e3 ("fuse: Add reference counting for fuse_io_priv") Cc: <stable@vger.kernel.org> # v4.6
Diffstat (limited to 'fs')
-rw-r--r--fs/fuse/file.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index cc2121b37bf5..b52f9baaa3e7 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2924,10 +2924,12 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
}
if (io->async) {
+ bool blocking = io->blocking;
+
fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
/* we have a non-extending, async request, so return */
- if (!io->blocking)
+ if (!blocking)
return -EIOCBQUEUED;
wait_for_completion(&wait);