CVE-2022-48821
Description
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: avoid double fput() on failed usercopy If the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free. Simply avoid calling dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.
How to fix
- linux linux_kernel5.4.180, 5.10.101, 5.15.24, 5.16.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.1 ≤ v < 5.4.180, 5.5 ≤ v < 5.10.101, 5.11 ≤ v < 5.15.24, 5.16 ≤ v < 5.16.10, 5.17 | 5.4.180, 5.10.101, 5.15.24, 5.16.10 |
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