On Tue, Feb 22, 2022 at 01:31:07AM -0600, Gustavo A. R. Silva wrote: > Replace one-element array with flexible-array member in struct > aac_aifcmd. > > This issue was found with the help of Coccinelle and audited and fixed, > manually. > > Link: https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays > Link: https://github.com/KSPP/linux/issues/79 > Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> > --- > drivers/scsi/aacraid/aacraid.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h > index 97948cd5f13c..447feabf5360 100644 > --- a/drivers/scsi/aacraid/aacraid.h > +++ b/drivers/scsi/aacraid/aacraid.h > @@ -2616,7 +2616,7 @@ struct aac_hba_info { > struct aac_aifcmd { > __le32 command; /* Tell host what type of notify this is */ > __le32 seqnum; /* To allow ordering of reports (if necessary) */ > - u8 data[1]; /* Undefined length (from kernel viewpoint) */ > + u8 data[]; /* Undefined length (from kernel viewpoint) */ > }; > > /** > -- > 2.27.0 > FWIW, this patch solves an -Warray-bounds warning that is seen under -fstrict-flex-arrays=3 (coming soon[1]): ../drivers/scsi/aacraid/commsup.c:1166:17: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds] (((__le32 *)aifcmd->data)[1] == cpu_to_le32(3)); ^ ~ ../drivers/scsi/aacraid/aacraid.h:2620:2: note: array 'data' declared here u8 data[1]; /* Undefined length (from kernel viewpoint) */ ^ ../drivers/scsi/aacraid/commsup.c:1286:20: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds] ((((__le32 *)aifcmd->data)[3] ^ ~ ../drivers/scsi/aacraid/aacraid.h:2620:2: note: array 'data' declared here u8 data[1]; /* Undefined length (from kernel viewpoint) */ ^ [1] new flag in GCC and Clang: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 https://reviews.llvm.org/D126864 -- Kees Cook
