| Message ID | 1569347584-3478-1-git-send-email-yibin.gong@nxp.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v1] dmaengine: imx-sdma: fix kernel hangs with SLUB slab allocator | expand |
On 24-09-19, 09:49, Robin Gong wrote: > Illegal memory will be touch if SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 > (41) exceed the size of structure sdma_script_start_addrs(40), > thus cause memory corrupt such as slob block header so that kernel > trap into while() loop forever in slob_free(). Please refer to below > code piece in imx-sdma.c: > for (i = 0; i < sdma->script_number; i++) > if (addr_arr[i] > 0) > saddr_arr[i] = addr_arr[i]; /* memory corrupt here */ > That issue was brought by commit a572460be9cf ("dmaengine: imx-sdma: Add > support for version 3 firmware") because SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 > (38->41 3 scripts added) not align with script number added in > sdma_script_start_addrs(2 scripts). Applied, thanks
On 14-10-19, 13:32, Vinod Koul wrote: > On 24-09-19, 09:49, Robin Gong wrote: > > Illegal memory will be touch if SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 > > (41) exceed the size of structure sdma_script_start_addrs(40), > > thus cause memory corrupt such as slob block header so that kernel > > trap into while() loop forever in slob_free(). Please refer to below > > code piece in imx-sdma.c: > > for (i = 0; i < sdma->script_number; i++) > > if (addr_arr[i] > 0) > > saddr_arr[i] = addr_arr[i]; /* memory corrupt here */ > > That issue was brought by commit a572460be9cf ("dmaengine: imx-sdma: Add > > support for version 3 firmware") because SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 > > (38->41 3 scripts added) not align with script number added in > > sdma_script_start_addrs(2 scripts). > > Applied, thanks And after applying I noticed the patch title is not apt. The patch title should reflect the change and not the cause or result. So I have modified the title to: "dmaengine: imx-sdma: fix size check for sdma script_number" Thanks
On 2019-10-14 Vinod Koul <vkoul@kernel.org> wrote: > On 14-10-19, 13:32, Vinod Koul wrote: > > On 24-09-19, 09:49, Robin Gong wrote: > > > Illegal memory will be touch if SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 > > > (41) exceed the size of structure sdma_script_start_addrs(40), thus > > > cause memory corrupt such as slob block header so that kernel trap > > > into while() loop forever in slob_free(). Please refer to below code > > > piece in imx-sdma.c: > > > for (i = 0; i < sdma->script_number; i++) > > > if (addr_arr[i] > 0) > > > saddr_arr[i] = addr_arr[i]; /* memory corrupt here */ That issue > > > was brought by commit a572460be9cf ("dmaengine: imx-sdma: Add > > > support for version 3 firmware") because > > > SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 > > > (38->41 3 scripts added) not align with script number added in > > > sdma_script_start_addrs(2 scripts). > > > > Applied, thanks > > And after applying I noticed the patch title is not apt. The patch title should > reflect the change and not the cause or result. > > So I have modified the title to: "dmaengine: imx-sdma: fix size check for sdma > script_number" Yes, You are right, thanks Vinod. > > Thanks > -- > ~Vinod
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 9ba74ab..c27e206 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -1707,6 +1707,14 @@ static void sdma_add_scripts(struct sdma_engine *sdma, if (!sdma->script_number) sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; + if (sdma->script_number > sizeof(struct sdma_script_start_addrs) + / sizeof(s32)) { + dev_err(sdma->dev, + "SDMA script number %d not match with firmware.\n", + sdma->script_number); + return; + } + for (i = 0; i < sdma->script_number; i++) if (addr_arr[i] > 0) saddr_arr[i] = addr_arr[i]; diff --git a/include/linux/platform_data/dma-imx-sdma.h b/include/linux/platform_data/dma-imx-sdma.h index 6eaa53c..30e676b 100644 --- a/include/linux/platform_data/dma-imx-sdma.h +++ b/include/linux/platform_data/dma-imx-sdma.h @@ -51,7 +51,10 @@ struct sdma_script_start_addrs { /* End of v2 array */ s32 zcanfd_2_mcu_addr; s32 zqspi_2_mcu_addr; + s32 mcu_2_ecspi_addr; /* End of v3 array */ + s32 mcu_2_zqspi_addr; + /* End of v4 array */ }; /**
Illegal memory will be touch if SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 (41) exceed the size of structure sdma_script_start_addrs(40), thus cause memory corrupt such as slob block header so that kernel trap into while() loop forever in slob_free(). Please refer to below code piece in imx-sdma.c: for (i = 0; i < sdma->script_number; i++) if (addr_arr[i] > 0) saddr_arr[i] = addr_arr[i]; /* memory corrupt here */ That issue was brought by commit a572460be9cf ("dmaengine: imx-sdma: Add support for version 3 firmware") because SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 (38->41 3 scripts added) not align with script number added in sdma_script_start_addrs(2 scripts). Fixes: a572460be9cf ("dmaengine: imx-sdma: Add support for version 3 firmware") Cc: stable@vger.kernel Link: https://www.spinics.net/lists/arm-kernel/msg754895.html Signed-off-by: Robin Gong <yibin.gong@nxp.com> Reported-by: Jurgen Lambrecht <J.Lambrecht@TELEVIC.com> --- drivers/dma/imx-sdma.c | 8 ++++++++ include/linux/platform_data/dma-imx-sdma.h | 3 +++ 2 files changed, 11 insertions(+)