| Message ID | 20200319222229.GA19280@embeddedor.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [next] media: venus: hfi_msgs.h: Replace zero-length array with flexible-array member | expand |
Hi Gustavo, Thanks for the patch! On 3/20/20 12:22 AM, Gustavo A. R. Silva wrote: > 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> > --- > drivers/media/platform/qcom/venus/hfi_msgs.h | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) Acked-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
diff --git a/drivers/media/platform/qcom/venus/hfi_msgs.h b/drivers/media/platform/qcom/venus/hfi_msgs.h index 7694b1d25d9d..526d9f5b487b 100644 --- a/drivers/media/platform/qcom/venus/hfi_msgs.h +++ b/drivers/media/platform/qcom/venus/hfi_msgs.h @@ -155,7 +155,7 @@ struct hfi_msg_session_empty_buffer_done_pkt { u32 input_tag; u32 packet_buffer; u32 extradata_buffer; - u32 data[0]; + u32 data[]; }; struct hfi_msg_session_fbd_compressed_pkt { @@ -175,7 +175,7 @@ struct hfi_msg_session_fbd_compressed_pkt { u32 picture_type; u32 packet_buffer; u32 extradata_buffer; - u32 data[0]; + u32 data[]; }; struct hfi_msg_session_fbd_uncompressed_plane0_pkt { @@ -202,7 +202,7 @@ struct hfi_msg_session_fbd_uncompressed_plane0_pkt { u32 picture_type; u32 packet_buffer; u32 extradata_buffer; - u32 data[0]; + u32 data[]; }; struct hfi_msg_session_fbd_uncompressed_plane1_pkt { @@ -211,7 +211,7 @@ struct hfi_msg_session_fbd_uncompressed_plane1_pkt { u32 filled_len; u32 offset; u32 packet_buffer2; - u32 data[0]; + u32 data[]; }; struct hfi_msg_session_fbd_uncompressed_plane2_pkt { @@ -220,7 +220,7 @@ struct hfi_msg_session_fbd_uncompressed_plane2_pkt { u32 filled_len; u32 offset; u32 packet_buffer3; - u32 data[0]; + u32 data[]; }; struct hfi_msg_session_parse_sequence_header_done_pkt {
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> --- drivers/media/platform/qcom/venus/hfi_msgs.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)