From: Colin Ian King Date: Thu, 29 Sep 2016 18:14:38 +0000 (+0100) Subject: dmaengine: coh901318: fix integer overflow when shifting more than 32 places X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9f0df936b1b93a7fab5b9ed73009f43369c121ea;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git dmaengine: coh901318: fix integer overflow when shifting more than 32 places Currently U300_DMA_CHANNELS is set to 40, meaning that the shift of 1 can be more than 32 places, which leads to a 32 bit integer overflow. Fix this by using 1ULL instead of 1 before shifting it. Also add braces on the for-loop to keep with coding style conventions. Signed-off-by: Colin Ian King Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c index a373ecacfaba..5b1d4a39b30b 100644 --- a/drivers/dma/coh901318.c +++ b/drivers/dma/coh901318.c @@ -1352,9 +1352,10 @@ static int coh901318_debugfs_read(struct file *file, char __user *buf, tmp += sprintf(tmp, "DMA -- enabled dma channels\n"); - for (i = 0; i < U300_DMA_CHANNELS; i++) - if (started_channels & (1 << i)) + for (i = 0; i < U300_DMA_CHANNELS; i++) { + if (started_channels & (1ULL << i)) tmp += sprintf(tmp, "channel %d\n", i); + } tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count);