CVE-2026-46190

In the Linux kernel, the following vulnerability has been resolved:

mtd: spi-nor: debugfs: fix out-of-bounds read in spinorparams_show()

Sashiko noticed an out-of-bounds read [1].

In spinorparamsshow(), the snorfnames array is passed to spinorprintflags() using sizeof(snorfnames).

Since snorfnames is an array of pointers, sizeof() returns the total number of bytes occupied by the pointers (element_count * sizeof(void *)) rather than the element count itself. On 64-bit systems, this makes the passed length 8x larger than intended.

Inside spinorprintflags(), the 'nameslen' argument is used to bounds-check the 'names' array access. An out-of-bounds read occurs if a flag bit is set that exceeds the array's actual element count but is within the inflated byte-size count.

Correct this by using ARRAY_SIZE() to pass the actual number of string pointers in the array.