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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-09-01 14:44:09 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-09-24 16:09:07 +0300 |
| commit | 8d11eb847de7d89c2754988c944d51a4f63e219b (patch) | |
| tree | df79b403e9542fa62845585534c971502e9a124a /drivers/media/pci/ivtv | |
| parent | 8d1a4817cce1b15b4909f0e324a4f5af5952da67 (diff) | |
| download | linux-8d11eb847de7d89c2754988c944d51a4f63e219b.tar.xz | |
media: pci: ivtv: Fix a sleep-in-atomic-context bug in ivtv_yuv_init()
The driver may sleep in a interrupt handler.
The function call paths (from bottom to top) in Linux-4.16 are:
[FUNC] kzalloc(GFP_KERNEL)
drivers/media/pci/ivtv/ivtv-yuv.c, 938:
kzalloc in ivtv_yuv_init
drivers/media/pci/ivtv/ivtv-yuv.c, 960:
ivtv_yuv_init in ivtv_yuv_next_free
drivers/media/pci/ivtv/ivtv-yuv.c, 1126:
ivtv_yuv_next_free in ivtv_yuv_setup_stream_frame
drivers/media/pci/ivtv/ivtv-irq.c, 827:
ivtv_yuv_setup_stream_frame in ivtv_irq_dec_data_req
drivers/media/pci/ivtv/ivtv-irq.c, 1013:
ivtv_irq_dec_data_req in ivtv_irq_handler
To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC.
This bug is found by my static analysis tool DSAC.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/pci/ivtv')
| -rw-r--r-- | drivers/media/pci/ivtv/ivtv-yuv.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-yuv.c b/drivers/media/pci/ivtv/ivtv-yuv.c index 44936d6d7c39..1380474519f2 100644 --- a/drivers/media/pci/ivtv/ivtv-yuv.c +++ b/drivers/media/pci/ivtv/ivtv-yuv.c @@ -935,7 +935,7 @@ static void ivtv_yuv_init(struct ivtv *itv) } /* We need a buffer for blanking when Y plane is offset - non-fatal if we can't get one */ - yi->blanking_ptr = kzalloc(720 * 16, GFP_KERNEL|__GFP_NOWARN); + yi->blanking_ptr = kzalloc(720 * 16, GFP_ATOMIC|__GFP_NOWARN); if (yi->blanking_ptr) { yi->blanking_dmaptr = pci_map_single(itv->pdev, yi->blanking_ptr, 720*16, PCI_DMA_TODEVICE); } else { |