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Subject[PATCH 4.9 048/105] ARM: omap2+: fixing wrong strcat for Non-NULL terminated string
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maninder Singh <maninder1.s@samsung.com>


[ Upstream commit 5066d5296ff2db20625e5f46e7338872c90c649f ]

Issue caught with static analysis tool:
"Dangerous usage of 'name' (strncpy doesn't always 0-terminate it)"

Use strlcpy _includes_ the NUL terminator, and strlcat() which ensures
that it won't overflow the buffer.

Reported-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Vaneet Narang <v.narang@samsung.com>
CC: Russell King <linux@armlinux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm/mach-omap2/omap_hwmod.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -790,14 +790,14 @@ static int _init_main_clk(struct omap_hw
int ret = 0;
char name[MOD_CLK_MAX_NAME_LEN];
struct clk *clk;
+ static const char modck[] = "_mod_ck";

- /* +7 magic comes from '_mod_ck' suffix */
- if (strlen(oh->name) + 7 > MOD_CLK_MAX_NAME_LEN)
+ if (strlen(oh->name) >= MOD_CLK_MAX_NAME_LEN - strlen(modck))
pr_warn("%s: warning: cropping name for %s\n", __func__,
oh->name);

- strncpy(name, oh->name, MOD_CLK_MAX_NAME_LEN - 7);
- strcat(name, "_mod_ck");
+ strlcpy(name, oh->name, MOD_CLK_MAX_NAME_LEN - strlen(modck));
+ strlcat(name, modck, MOD_CLK_MAX_NAME_LEN);

clk = clk_get(NULL, name);
if (!IS_ERR(clk)) {

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