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2b117897d5
mmap() returns MAP_FAILED on error, not NULL. The current check uses !buffer->ptr, which evaluates to false when mmap() fails (since MAP_FAILED is (void *)-1, not 0), so the error path is never taken. Link: https://lore.kernel.org/20260512101305.139509-1-lihongfu@kylinos.cn Signed-off-by: Hongfu Li <lihongfu@kylinos.cn> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Dev Jain <dev.jain@arm.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: Donet Tom <donettom@linux.ibm.com> Reviewed-by: Lorenzo Stoakes <ljs@kernel.org> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>