From: Tom Rix trix@redhat.com
clang static analysis flags this error
sil-sii8620.c:184:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn] return ret; ^~~~~~~~~~
sii8620_readb calls sii8620_read_buf. sii8620_read_buf can return without setting its output pararmeter 'ret'.
So initialize ret.
Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")
Signed-off-by: Tom Rix trix@redhat.com --- drivers/gpu/drm/bridge/sil-sii8620.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c index 3540e4931383..da933d477e5f 100644 --- a/drivers/gpu/drm/bridge/sil-sii8620.c +++ b/drivers/gpu/drm/bridge/sil-sii8620.c @@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
static u8 sii8620_readb(struct sii8620 *ctx, u16 addr) { - u8 ret; + u8 ret = 0;
sii8620_read_buf(ctx, addr, &ret, 1); return ret;
Hi Tom,
Thank you for the patch.
On Sun, Jul 12, 2020 at 08:24:53AM -0700, trix@redhat.com wrote:
From: Tom Rix trix@redhat.com
clang static analysis flags this error
sil-sii8620.c:184:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn] return ret; ^~~~~~~~~~
sii8620_readb calls sii8620_read_buf. sii8620_read_buf can return without setting its output pararmeter 'ret'.
So initialize ret.
Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")
Signed-off-by: Tom Rix trix@redhat.com
Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com
drivers/gpu/drm/bridge/sil-sii8620.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c index 3540e4931383..da933d477e5f 100644 --- a/drivers/gpu/drm/bridge/sil-sii8620.c +++ b/drivers/gpu/drm/bridge/sil-sii8620.c @@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len) static u8 sii8620_readb(struct sii8620 *ctx, u16 addr) {
- u8 ret;
- u8 ret = 0;
sii8620_read_buf(ctx, addr, &ret, 1); return ret;
On 12.07.2020 17:24, trix@redhat.com wrote:
From: Tom Rix trix@redhat.com
clang static analysis flags this error
sil-sii8620.c:184:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn] return ret; ^~~~~~~~~~
sii8620_readb calls sii8620_read_buf. sii8620_read_buf can return without setting its output pararmeter 'ret'.
So initialize ret.
Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")
Signed-off-by: Tom Rix trix@redhat.com
drivers/gpu/drm/bridge/sil-sii8620.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c index 3540e4931383..da933d477e5f 100644 --- a/drivers/gpu/drm/bridge/sil-sii8620.c +++ b/drivers/gpu/drm/bridge/sil-sii8620.c @@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len) static u8 sii8620_readb(struct sii8620 *ctx, u16 addr) {
- u8 ret;
- u8 ret = 0;
In theory it shouldn't cause any harm, but this protections makes things simpler.
Reviewed-by: Andrzej Hajda a.hajda@samsung.com
Regards Andrzej
sii8620_read_buf(ctx, addr, &ret, 1); return ret;
Hi Tom.
On Sun, Jul 12, 2020 at 08:24:53AM -0700, trix@redhat.com wrote:
From: Tom Rix trix@redhat.com
clang static analysis flags this error
sil-sii8620.c:184:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn] return ret; ^~~~~~~~~~
sii8620_readb calls sii8620_read_buf. sii8620_read_buf can return without setting its output pararmeter 'ret'.
So initialize ret.
Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")
Signed-off-by: Tom Rix trix@redhat.com
Thnaks, applied to drm-misc-next as the fix is not urgent.
Sam
drivers/gpu/drm/bridge/sil-sii8620.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c index 3540e4931383..da933d477e5f 100644 --- a/drivers/gpu/drm/bridge/sil-sii8620.c +++ b/drivers/gpu/drm/bridge/sil-sii8620.c @@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len) static u8 sii8620_readb(struct sii8620 *ctx, u16 addr) {
- u8 ret;
- u8 ret = 0;
sii8620_read_buf(ctx, addr, &ret, 1); return ret; -- 2.18.1
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