fs/buffer: fix use-after-free when call bh_read() helper

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

CVE-2025-39691 · Microsoft / collected KEV context

cve-program · CVE-2025-39691

• https://git.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9
• https://git.kernel.org/stable/c/3169edb8945c295cf89120fc6b2c35cfe3ad4c9e
• https://git.kernel.org/stable/c/03b40bf5d0389ca23ae6857ee25789f0e0b47ce8
• https://git.kernel.org/stable/c/c58c6b532b7b69537cfd9ef701c7e37cdcf79dc4
• https://git.kernel.org/stable/c/c5aa6ba1127307ab5dc3773eaf40d73a3423841f
• https://git.kernel.org/stable/c/042cf48ecf67f72c8b3846c7fac678f472712ff3
• https://git.kernel.org/stable/c/90b5193edb323fefbee0e4e5bc39ed89dcc37719
• https://git.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49

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