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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-05 05:00:11 -0600
committerDaniel Vetter <daniel.vetter@ffwll.ch>2020-03-06 11:52:01 +0100
commit78a7b61aefa341db7c55d58a66842c34dd50db6d (patch)
treec6adbae951f00659ae9767cda95e8f5011b28bef /include/drm
parent5b2adbddf25c3543b265c0b8834a4580b971f71e (diff)
downloadlinux-78a7b61aefa341db7c55d58a66842c34dd50db6d.tar.bz2
drm/bridge/mhl.h: 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: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20200305110011.GA21056@embeddedor
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/bridge/mhl.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/drm/bridge/mhl.h b/include/drm/bridge/mhl.h
index 1cc77bf38324..d96626a0e3fa 100644
--- a/include/drm/bridge/mhl.h
+++ b/include/drm/bridge/mhl.h
@@ -327,13 +327,13 @@ struct mhl_burst_bits_per_pixel_fmt {
struct {
u8 stream_id;
u8 pixel_format;
- } __packed desc[0];
+ } __packed desc[];
} __packed;
struct mhl_burst_emsc_support {
struct mhl3_burst_header hdr;
u8 num_entries;
- __be16 burst_id[0];
+ __be16 burst_id[];
} __packed;
struct mhl_burst_audio_descr {