From 9b980d950e5bcdce6dbc15a9c00ff960beeea28b Mon Sep 17 00:00:00 2001
From: tcharding <me@tobin.cc>
Date: Wed, 15 Mar 2017 19:48:03 +1100
Subject: [PATCH] mmc: core: guard dereference of optional parameter
Various functions take as parameter an optional pointer. Pointer
should be guarded with non-NULL check before dereferencing.
Add non-NULL check before dereference of pointer.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
drivers/mmc/core/sdio_io.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c
index 74195d772f5a..348231418565 100644
--- a/drivers/mmc/core/sdio_io.c
+++ b/drivers/mmc/core/sdio_io.c
@@ -373,7 +373,8 @@ u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret)
u8 val;
if (!func) {
- *err_ret = -EINVAL;
+ if (err_ret)
+ *err_ret = -EINVAL;
return 0xFF;
}
@@ -407,7 +408,8 @@ void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret)
int ret;
if (!func) {
- *err_ret = -EINVAL;
+ if (err_ret)
+ *err_ret = -EINVAL;
return;
}
@@ -635,7 +637,8 @@ unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
unsigned char val;
if (!func) {
- *err_ret = -EINVAL;
+ if (err_ret)
+ *err_ret = -EINVAL;
return 0xFF;
}
@@ -673,7 +676,8 @@ void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
int ret;
if (!func) {
- *err_ret = -EINVAL;
+ if (err_ret)
+ *err_ret = -EINVAL;
return;
}