media: s3c-camif: fix out-of-bounds array access

[ Upstream commit a398e043637a4819a0e96467bfecaabf3224dd62 ]

While experimenting with older compiler versions, I ran
into a warning that no longer shows up on gcc-4.8 or newer:

drivers/media/platform/s3c-camif/camif-capture.c: In function '__camif_subdev_try_format':
drivers/media/platform/s3c-camif/camif-capture.c:1265:25: error: array subscript is below array bounds

This is an off-by-one bug, leading to an access before the start of the
array, while newer compilers silently assume this undefined behavior
cannot happen and leave the loop at index 0 if no other entry matches.

As Sylvester explains, we actually need to ensure that the
value is within the range, so this reworks the loop to be
easier to parse correctly, and an additional check to fall
back on the first format value for any unexpected input.

I found an existing gcc bug for it and added a reduced version
of the function there.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69249#c3
Fixes: babde1c243b2 ("[media] V4L: Add driver for S3C24XX/S3C64XX SoC series camera interface")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/platform/s3c-camif/camif-capture.c b/drivers/media/platform/s3c-camif/camif-capture.c
index 25c7a7d42292fca87ebccda4979e5fcded1c2c9a..0f0324a14d515552939cc697b03ab0f0575ec30a 100644 (file)
--- a/drivers/media/platform/s3c-camif/camif-capture.c
+++ b/drivers/media/platform/s3c-camif/camif-capture.c
@@ -1256,16 +1256,17 @@ static void __camif_subdev_try_format(struct camif_dev *camif,
 {
        const struct s3c_camif_variant *variant = camif->variant;
        const struct vp_pix_limits *pix_lim;
-       int i = ARRAY_SIZE(camif_mbus_formats);
+       unsigned int i;
 
        /* FIXME: constraints against codec or preview path ? */
        pix_lim = &variant->vp_pix_limits[VP_CODEC];
 
-       while (i-- >= 0)
+       for (i = 0; i < ARRAY_SIZE(camif_mbus_formats); i++)
                if (camif_mbus_formats[i] == mf->code)
                        break;
 
-       mf->code = camif_mbus_formats[i];
+       if (i == ARRAY_SIZE(camif_mbus_formats))
+               mf->code = camif_mbus_formats[0];
 
        if (pad == CAMIF_SD_PAD_SINK) {
                v4l_bound_align_image(&mf->width, 8, CAMIF_MAX_PIX_WIDTH,