In support of enabling -Warray-bounds and -Wzero-length-bounds and correctly handling run-time memcpy() bounds checking, replace all open-coded flexible arrays (i.e. 0-element arrays) in unions with the DECLARE_FLEX_ARRAY() helper macro. This fixes warnings such as: fs/hpfs/anode.c: In function 'hpfs_add_sector_to_btree': fs/hpfs/anode.c:209:27: warning: array subscript 0 is outside the bounds of an interior zero-length array 'struct bplus_internal_node[0]' [-Wzero-length-bounds] 209 | anode->btree.u.internal[0].down = cpu_to_le32(a); | ~~~~~~~~~~~~~~~~~~~~~~~^~~ In file included from fs/hpfs/hpfs_fn.h:26, from fs/hpfs/anode.c:10: fs/hpfs/hpfs.h:412:32: note: while referencing 'internal' 412 | struct bplus_internal_node internal[0]; /* (internal) 2-word entries giving | ^~~~~~~~ drivers/net/can/usb/etas_es58x/es58x_fd.c: In function 'es58x_fd_tx_can_msg': drivers/net/can/usb/etas_es58x/es58x_fd.c:360:35: warning: array subscript 65535 is outside the bounds of an interior zero-length array 'u8[0]' {aka 'unsigned char[]'} [-Wzero-length-bounds] 360 | tx_can_msg = (typeof(tx_can_msg))&es58x_fd_urb_cmd->raw_msg[msg_len]; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/net/can/usb/etas_es58x/es58x_core.h:22, from drivers/net/can/usb/etas_es58x/es58x_fd.c:17: drivers/net/can/usb/etas_es58x/es58x_fd.h:231:6: note: while referencing 'raw_msg' 231 | u8 raw_msg[0]; | ^~~~~~~
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| @@ -141,8 +141,8 @@ struct rxe_dma_info { · 140 unmodified lines | ||
| 141 | 141 | __u32 sge_offset; |
| 142 | 142 | __u32 reserved; |
| 143 | 143 | union { |
| 144 | − __u8 inline_data[0]; | |
| 145 | − struct rxe_sge sge[0]; | |
| 144 | + __DECLARE_FLEX_ARRAY(__u8, inline_data); | |
| 145 | + __DECLARE_FLEX_ARRAY(struct rxe_sge, sge); | |
| 146 | 146 | }; |
| 147 | 147 | }; |
| 148 | 148 | |
| @@ -240,8 +240,8 @@ struct snd_soc_tplg_vendor_array { · 239 unmodified lines | ||
| 240 | 240 | struct snd_soc_tplg_private { |
| 241 | 241 | __le32 size; /* in bytes of private data */ |
| 242 | 242 | union { |
| 243 | − char data[0]; | |
| 244 | − struct snd_soc_tplg_vendor_array array[0]; | |
| 243 | + __DECLARE_FLEX_ARRAY(char, data); | |
| 244 | + __DECLARE_FLEX_ARRAY(struct snd_soc_tplg_vendor_array, array); | |
| 245 | 245 | }; |
| 246 | 246 | } __attribute__((packed)); |
| 247 | 247 | |