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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-03-25 07:45:10 -1000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-03-25 07:45:10 -1000 |
| commit | cb6416592bc2a8b731dabcec0d63cda270764fc6 (patch) | |
| tree | 75cf1ef5080a24f66f482670953892c6baf4d168 | |
| parent | d2862360bfe54fd63618dbabf09191c4c0dc7576 (diff) | |
| parent | 3e4543bf20531d1cdb8672d25b3f2ff6d3d07627 (diff) | |
| download | linux-cb6416592bc2a8b731dabcec0d63cda270764fc6.tar.bz2 | |
Merge tag 'dmaengine-fix-4.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/slave-dma
Pull dmaengine fix from Vinod Koul:
"One small fix for stm32-dmamux fixing buffer overflow"
* tag 'dmaengine-fix-4.16-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/slave-dma:
dmaengine: stm32-dmamux: fix a potential buffer overflow
| -rw-r--r-- | drivers/dma/stm32-dmamux.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index 4dbb30cf94ac..b922db90939a 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -118,14 +118,15 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, spin_lock_irqsave(&dmamux->lock, flags); mux->chan_id = find_first_zero_bit(dmamux->dma_inuse, dmamux->dma_requests); - set_bit(mux->chan_id, dmamux->dma_inuse); - spin_unlock_irqrestore(&dmamux->lock, flags); if (mux->chan_id == dmamux->dma_requests) { + spin_unlock_irqrestore(&dmamux->lock, flags); dev_err(&pdev->dev, "Run out of free DMA requests\n"); ret = -ENOMEM; - goto error; + goto error_chan_id; } + set_bit(mux->chan_id, dmamux->dma_inuse); + spin_unlock_irqrestore(&dmamux->lock, flags); /* Look for DMA Master */ for (i = 1, min = 0, max = dmamux->dma_reqs[i]; @@ -173,6 +174,8 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, error: clear_bit(mux->chan_id, dmamux->dma_inuse); + +error_chan_id: kfree(mux); return ERR_PTR(ret); } |