CVE-2024-56712

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cfPatch
• https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439ePatch
• https://git.kernel.org/stable/c/00ebdef47994206f60546929a0f6f63285497272
• https://git.kernel.org/stable/c/e469922fbdf6ad729e5dc8d49289b5036a0ecdf8