MIPS: mm: Fix out-of-bounds write in maar_res_walk()

maar_res_walk() uses wi->num_cfg as the index into the fixed-size
wi->cfg array, but checks whether the array is full only after it has
filled the selected entry. If walk_system_ram_range() reports more than
16 memory ranges, the overflow call writes one struct maar_config past
the end of the array before WARN_ON() prevents num_cfg from advancing.

Move the full-array check before taking the array slot and return non-zero
when the scratch array is full, so walk_system_ram_range() terminates the
walk instead of invoking the callback for further ranges.

Fixes: a5718fe8f70f ("MIPS: mm: Drop boot_mem_map")

Signed-off-by: Yadan Fan <ydfan@suse.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

0 files changed, 0 insertions, 0 deletions