While dma_mask_bits is larger than 64, the bahvaiour is undefined. On the
other hand, dma_mask_bits which is smaller than 20 (1MB) makes no sense
in real hardware.
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Barry Song <song.bao....@hisilicon.com>
---
kernel/dma/map_benchmark.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
index b1496e744c68..19f661692073 100644
--- a/kernel/dma/map_benchmark.c
+++ b/kernel/dma/map_benchmark.c
@@ -214,6 +214,12 @@ static long map_benchmark_ioctl(struct file *file,
unsigned int cmd,
return -EINVAL;
}
+ if (map->bparam.dma_bits < 20 ||
+ map->bparam.dma_bits > 64) {
+ pr_err("invalid dma_bits\n");
+ return -EINVAL;
+ }
+
if (map->bparam.node != NUMA_NO_NODE &&
!node_possible(map->bparam.node)) {
pr_err("invalid numa node\n");
--
2.25.1
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