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| author | Pierre-Yves MORDRET <pierre-yves.mordret@st.com> | 2018-03-13 19:55:35 +0300 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2018-03-22 08:21:35 +0300 |
| commit | 3e4543bf20531d1cdb8672d25b3f2ff6d3d07627 (patch) | |
| tree | 0e4ccf921f0c9f47e68e0f242596302e212e35be /security/device_cgroup.c | |
| parent | 0c8efd610b58cb23cefdfa12015799079aef94ae (diff) | |
| download | linux-3e4543bf20531d1cdb8672d25b3f2ff6d3d07627.tar.xz | |
dmaengine: stm32-dmamux: fix a potential buffer overflow
The bitfield dma_inuse is allocated of size dma_requests bits, thus a
valid bit address is from 0 to (dma_requests - 1).
When find_first_zero_bit() fails, it returns dma_requests as invalid
address.
Using such address for the following set_bit() is incorrect and, if
dma_requests is a multiple of BITS_PER_LONG, it will cause a buffer
overflow.
Currently this driver is only used in DT stm32h743.dtsi where a safe value
dma_requests=16 is not triggering the buffer overflow.
Fixed by checking the return value of find_first_zero_bit() _before_
using it.
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'security/device_cgroup.c')
0 files changed, 0 insertions, 0 deletions