dma-buf: insert memory barrier before updating num_fences

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2025-38095 · Microsoft / collected KEV context

cve-program · CVE-2025-38095

• https://git.kernel.org/stable/c/90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f
• https://git.kernel.org/stable/c/d0b7f11dd68b593bd970e5735be00e8d89bace30
• https://git.kernel.org/stable/c/3becc659f9cb76b481ad1fb71f54d5c8d6332d3f
• https://git.kernel.org/stable/c/c9d2b9a80d06a58f37e0dc8c827075639b443927
• https://git.kernel.org/stable/c/fe1bebd0edb22e3536cbc920ec713331d1367ad4
• https://git.kernel.org/stable/c/08680c4dadc6e736c75bc2409d833f03f9003c51
• https://git.kernel.org/stable/c/72c7d62583ebce7baeb61acce6057c361f73be4a

No related operational record is retained in the current change model.