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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-04-06 20:09:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 10:43:42 -0700
commita44ce5137026493b3bec3768cff92861dbeede5c (patch)
treee2238afd46ea30510ce95ec9d78386f2f7e77dfa /lib/bch.c
parentaecd42df6d399346fd8e5551dd8878338f214ec1 (diff)
lib/bch.c: 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 inadvertenly introduced[3] to the codebase from now on. 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: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20200211205119.GA21234@embeddedor Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bch.c')
-rw-r--r--lib/bch.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/bch.c b/lib/bch.c
index 5db6d3a4c8a6..052d3fb753a0 100644
--- a/lib/bch.c
+++ b/lib/bch.c
@@ -102,7 +102,7 @@
*/
struct gf_poly {
unsigned int deg; /* polynomial degree */
- unsigned int c[0]; /* polynomial terms */
+ unsigned int c[]; /* polynomial terms */
};
/* given its degree, compute a polynomial size in bytes */