Liam Mark 31eb79db42 staging: android: ion: Support cpu access during dma_buf_detach ... Often userspace doesn't know when the kernel will be calling dma_buf_detach on the buffer. If userpace starts its CPU access at the same time as the sg list is being freed it could end up accessing the sg list after it has been freed. Thread A Thread B - DMA_BUF_IOCTL_SYNC IOCT - ion_dma_buf_begin_cpu_access - list_for_each_entry - ion_dma_buf_detatch - free_duped_table - dma_sync_sg_for_cpu Fix this by getting the ion_buffer lock before freeing the sg table memory. Fixes: 2a55e7b5e5 ("staging: android: ion: Call dma_map_sg for syncing and mapping") Signed-off-by: Liam Mark <lmark@codeaurora.org> Acked-by: Laura Abbott <labbott@redhat.com> Acked-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-01-22 11:38:09 +01:00
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ion	staging: android: ion: Support cpu access during dma_buf_detach	2019-01-22 11:38:09 +01:00
uapi	staging: android: ion: Fix license identifier comment format	2018-05-08 13:34:39 +02:00
ashmem.c	staging: android: ashmem: doc: Fix spelling	2018-12-19 10:40:51 +01:00
ashmem.h	staging: android: Clean up license identifiers	2018-05-08 13:24:15 +02:00
Kconfig	staging: android: Kconfig; Remove excessive hyphens	2018-05-08 13:24:15 +02:00
Makefile	staging: Android: Add 'vsoc' driver for cuttlefish.	2018-04-23 14:51:37 +02:00
TODO	staging: Android: vsoc: Create wc kernel mapping for region shm.	2018-05-03 13:53:03 -07:00
vsoc.c	staging: android/vsoc: stop using 'timespec'	2018-06-28 21:57:06 +09:00