The Dhara flash translation layer disk driver (drivers/disk/ftldhara.c) implemented the dharanand_ callbacks so that, on a flash error, the error code was written unconditionally through the caller-supplied dharaerrort err pointer (e.g. *err = DHARAEECC in dharanandread, and similar in dharananderase/prog/copy). The upstream Dhara library calls these callbacks with err == NULL along its journal-resume binary search: findlastcheckblock() invokes findcheckblock(j, mid, &found, NULL), which forwards the NULL pointer into dharanandread(). This path runs during diskftlaccessinit() -> dharamapresume() whenever the FTL disk is mounted/initialised. If a flash read error (uncorrectable ECC, bad block, controller error) occurs on one of the probed checkpoint pages, the driver dereferences and writes to NULL, faulting the kernel (denial of service). The trigger is conditioned on the NAND medium content/health, which can be influenced by media wear, induced faults, or a corrupted/crafted on-flash image. The fix routes all error assignments through the library's NULL-safe dharaseterror() helper. Affects Zephyr v4.4.0, where the driver was introduced.
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"2026-07-15T07:34:32Z"