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Blackfin: fix read buffer overflow 

Check whether index is within bounds before testing the element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Roel Kluin 2009-08-02 14:26:48 +02:00 committed by Mike Frysinger
parent 0e101ec12e
commit ac860751eb
1 changed files with 4 additions and 4 deletions
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8
arch/blackfin/kernel/bfin_dma_5xx.c
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@ -147,8 +147,8 @@ EXPORT_SYMBOL(request_dma);
int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data)
{
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_DMA_CHANNELS));
BUG_ON(channel >= MAX_DMA_CHANNELS ||
dma_ch[channel].chan_status == DMA_CHANNEL_FREE);
if (callback != NULL) {
int ret;
@ -182,8 +182,8 @@ static void clear_dma_buffer(unsigned int channel)
void free_dma(unsigned int channel)
{
pr_debug("freedma() : BEGIN \n");
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_DMA_CHANNELS));
BUG_ON(channel >= MAX_DMA_CHANNELS ||
dma_ch[channel].chan_status == DMA_CHANNEL_FREE);
/* Halt the DMA */
disable_dma(channel);