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author | Robin Gong <yibin.gong@nxp.com> | 2019-09-24 09:49:18 +0000 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-29 10:21:49 +0100 |
commit | c6fe228aa2cbb4c6553ecc3f0d2815f03b3ab973 (patch) | |
tree | f0c0d00f3ac88d29f98350b281047c071290105c | |
parent | b78a491abe05d8063d4e9c39042681d87bc4633a (diff) |
dmaengine: imx-sdma: fix size check for sdma script_number
[ Upstream commit bd73dfabdda280fc5f05bdec79b6721b4b2f035f ]
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>
Link: https://lore.kernel.org/r/1569347584-3478-1-git-send-email-yibin.gong@nxp.com
[vkoul: update the patch title]
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | drivers/dma/imx-sdma.c | 8 | ||||
-rw-r--r-- | include/linux/platform_data/dma-imx-sdma.h | 3 |
2 files changed, 11 insertions, 0 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index dd97dbf6618c..1dc06e0e890f 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -1411,6 +1411,14 @@ 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 2d08816720f6..5bb0a119f39a 100644 --- a/include/linux/platform_data/dma-imx-sdma.h +++ b/include/linux/platform_data/dma-imx-sdma.h @@ -50,7 +50,10 @@ 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 */ }; /** |