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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | linux | < 5.16.10-1 | linux_5.16.10-1_all.deb |
Debian | 11 | all | linux | < 5.10.103-1 | linux_5.10.103-1_all.deb |
Debian | 999 | all | linux | < 5.16.10-1 | linux_5.16.10-1_all.deb |
Debian | 13 | all | linux | < 5.16.10-1 | linux_5.16.10-1_all.deb |