https://github.com/torvalds/linux
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>
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File | Mode | Size |
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Kconfig | -rw-r--r-- | 1.0 KB |
Makefile | -rw-r--r-- | 225 bytes |
af_mpls.c | -rw-r--r-- | 63.6 KB |
internal.h | -rw-r--r-- | 5.8 KB |
mpls_gso.c | -rw-r--r-- | 2.3 KB |
mpls_iptunnel.c | -rw-r--r-- | 7.7 KB |
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