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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-21 10:00:05 -0600
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2020-03-02 16:32:17 +0100
commit451787d3e2ac3a25abae91792b7154ee533b65c6 (patch)
treea02afdc4fb56590b6267d31a13a5abcfffa62e30 /drivers/video/fbdev
parent9dff9a3666f15f4c76d9ddfa52744a1e86fd0ff6 (diff)
video: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200221160005.GA13552@embeddedor
Diffstat (limited to 'drivers/video/fbdev')
-rw-r--r--drivers/video/fbdev/mmp/hw/mmp_ctrl.h2
-rw-r--r--drivers/video/fbdev/ssd1307fb.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/fbdev/mmp/hw/mmp_ctrl.h b/drivers/video/fbdev/mmp/hw/mmp_ctrl.h
index 335d4983dc52..167585a889d3 100644
--- a/drivers/video/fbdev/mmp/hw/mmp_ctrl.h
+++ b/drivers/video/fbdev/mmp/hw/mmp_ctrl.h
@@ -1406,7 +1406,7 @@ struct mmphw_ctrl {
/*pathes*/
int path_num;
- struct mmphw_path_plat path_plats[0];
+ struct mmphw_path_plat path_plats[];
};
static inline int overlay_is_vid(struct mmp_overlay *overlay)
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index 1a0bd78f9345..12fa1050f3eb 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -89,7 +89,7 @@ struct ssd1307fb_par {
struct ssd1307fb_array {
u8 type;
- u8 data[0];
+ u8 data[];
};
static const struct fb_fix_screeninfo ssd1307fb_fix = {