CVE-2021-47305

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

dma-buf/sync_file: Dont leak fences on merge failure

Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we werent calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we werent freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path.

Affected Software

References

• https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce
• https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27
• https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8
• https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902
• https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8
• https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435
• https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce
• https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27
• https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8
• https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902
• https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8
• https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435