[PATCH] fuse: BUG_ON correction in fuse_dev_splice_write()

[Vasily Averin]

commit 963545357202 ("fuse: reduce allocation size for splice_write")
changed size of bufs array, so BUG_ON which checks the index of the array
shold also be fixed.

Fixes: 963545357202 ("fuse: reduce allocation size for splice_write")
Signed-off-by: Vasily Averin <v...@virtuozzo.com>
---
 fs/fuse/dev.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ea8237513dfa..f4ef6e01642c 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -2029,7 +2029,7 @@ static ssize_t fuse_dev_splice_write(struct 
pipe_inode_info *pipe,
                                     struct file *out, loff_t *ppos,
                                     size_t len, unsigned int flags)
 {
-       unsigned nbuf;
+       unsigned nbuf, bsize;
        unsigned idx;
        struct pipe_buffer *bufs;
        struct fuse_copy_state cs;
@@ -2043,7 +2043,8 @@ static ssize_t fuse_dev_splice_write(struct 
pipe_inode_info *pipe,
 
        pipe_lock(pipe);
 
-       bufs = kvmalloc_array(pipe->nrbufs, sizeof(struct pipe_buffer),
+       bsize = pipe->nrbufs;
+       bufs = kvmalloc_array(bsize, sizeof(struct pipe_buffer),
                              GFP_KERNEL);
        if (!bufs) {
                pipe_unlock(pipe);
@@ -2064,7 +2065,7 @@ static ssize_t fuse_dev_splice_write(struct 
pipe_inode_info *pipe,
                struct pipe_buffer *ibuf;
                struct pipe_buffer *obuf;
 
-               BUG_ON(nbuf >= pipe->buffers);
+               BUG_ON(nbuf >= bsize);
                BUG_ON(!pipe->nrbufs);
                ibuf = &pipe->bufs[pipe->curbuf];
                obuf = &bufs[nbuf];
-- 
2.17.1