Bug 2405123 (CVE-2025-40015)

Summary: CVE-2025-40015 kernel: media: stm32-csi: Fix dereference before NULL check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-20 17:23:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: stm32-csi: Fix dereference before NULL check

In 'stm32_csi_start', 'csidev->s_subdev' is dereferenced directly while
assigning a value to the 'src_pad'. However the same value is being
checked against NULL at a later point of time indicating that there
are chances that the value can be NULL.

Move the dereference after the NULL check.
Comment 1 Jon Moroney 2025-10-20 17:53:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102004-CVE-2025-40015-2fe0@gregkh/T