[PATCH][next] uapi: target: Replace fake flex-array with flexible-array member

Gustavo A. R. Silva
2023-03-17T16:59:28Z

Zero-length arrays as fake flexible arrays are deprecated and we are
moving towards adopting C99 flexible-array members instead.

Address the following warning found with GCC-13 and
-fstrict-flex-arrays=3 enabled:
CC drivers/target/target_core_user.o
drivers/target/target_core_user.c: In function ‘queue_cmd_ring’:
drivers/target/target_core_user.c:1096:15: warning: array subscript 0 is outside array bounds of ‘struct iovec[0]’ [-Warray-bounds=]
1096 | iov = &entry->req.iov[0];
| ^~~~~~~~~~~~~~~~~~
In file included from drivers/target/target_core_user.c:31:
./include/uapi/linux/target_core_user.h:122:38: note: while referencing ‘iov’
122 | struct iovec iov[0];
| ^~~

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].

Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/270
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
include/uapi/linux/target_core_user.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/target_core_user.h b/include/uapi/linux/target_core_user.h
index fbd8ca67e107..f925a77f19ed 100644
--- a/include/uapi/linux/target_core_user.h
+++ b/include/uapi/linux/target_core_user.h
@@ -119,7 +119,7 @@ struct tcmu_cmd_entry {
__u64 cdb_off;
__u64 __pad1;
__u64 __pad2;
- struct iovec iov[0];
+ __DECLARE_FLEX_ARRAY(struct iovec, iov);
} req;
struct {
__u8 scsi_status;
--
2.34.1