CVE-2026-89440mmc: via-sdmmc: stop card-detect handling on probe failure

Official description

In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: stop card-detect handling on probe failure request_irq() registers the SD card-detect interrupt and the probe enables it before mmc_add_host() runs. If mmc_add_host() fails, the error path only unmaps the registers and returns: the interrupt stays registered, so the handler keeps running against the host once it is freed. via_sdc_isr() dereferences sdhost and its MMIO base and schedules carddet_work, which via_sdc_card_detect() also runs against freed memory through its container_of() dereference. Add a probe-error path that disables and frees the interrupt and cancels carddet_work before unmapping. carddet_work can re-enable the device interrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it again after cancelling the work. This issue was found by an in-house static analysis tool and confirmed by manual code review.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8
• https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1
• https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49
• https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02
• https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99
• https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b
• https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4
• https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d