Arnd Bergmann <arnd@xxxxxxxx> writes: > gcc-10 correctly points out a bug with a zero-length array in > struct ath10k_pci: > > drivers/net/wireless/ath/ath10k/ahb.c: In function 'ath10k_ahb_remove': > drivers/net/wireless/ath/ath10k/ahb.c:30:9: error: array subscript 0 > is outside the bounds of an interior zero-length array 'struct > ath10k_ahb[0]' [-Werror=zero-length-bounds] > 30 | return &((struct ath10k_pci *)ar->drv_priv)->ahb[0]; > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > In file included from drivers/net/wireless/ath/ath10k/ahb.c:13: > drivers/net/wireless/ath/ath10k/pci.h:185:20: note: while referencing 'ahb' > 185 | struct ath10k_ahb ahb[0]; > | ^~~ > > The last addition to the struct ignored the comments and added > new members behind the array that must remain last. > > Change it to a flexible-array member and move it last again to > make it work correctly, prevent the same thing from happening > again (all compilers warn about flexible-array members in the > middle of a struct) and get it to build without warnings. Very good find, thanks! This bug would cause all sort of strange memory corruption issues. -- https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
