soc: qcom: dcc: avoid memory access violation



When *ppos + len is overflow, shrink len to max readable size
of SRAM.

Change-Id: I7c35433d384eb596a3f84b7ce13652f58166b40a
Signed-off-by: Yuanfang Zhang <zhangyuanfang@codeaurora.org>

parent a9e3b4c7

drivers/soc/qcom/dcc_v2.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1558,7 +1558,8 @@ static ssize_t dcc_sram_read(struct file file, char __user data,
		if (drvdata->ram_size <= *ppos)
		return 0;

		if ((*ppos + len) > drvdata->ram_size)
		if ((*ppos + len) < len
		\|\| (*ppos + len) > drvdata->ram_size)
		len = (drvdata->ram_size - *ppos);

		buf = kzalloc(len, GFP_KERNEL);