CVE-2024-56712

In the Linux kernel, the following vulnerability has been resolved:

udmabuf: fix memory leak on last export_udmabuf() error path

In export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a

dma_buf owning the udmabuf has already been created; but the error handling

in udmabuf_create() will tear down the udmabuf without doing anything about

the containing dma_buf.

This leaves a dma_buf in memory that contains a dangling pointer; though

that doesn't seem to lead to anything bad except a memory leak.

Fix it by moving the dma_buf_fd() call out of export_udmabuf() so that we

can give it different error handling.

Note that the shape of this code changed a lot in commit 5e72b2b41a21

("udmabuf: convert udmabuf driver to use folios"); but the memory leak

seems to have existed since the introduction of udmabuf.