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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-20 07:20:17 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-02-23 19:24:51 +0100
commit6bc3f3979edce0b11deb685a4c817abb7d74b227 (patch)
tree3ce2cf2b7886400097251d33c05435653bcafe9b /drivers/usb/dwc2/hcd.h
parent2f41c8a25feb822203f92e17f3720397805d0cfd (diff)
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USB: Replace zero-length array with flexible-array member
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> Link: https://lore.kernel.org/r/20200220132017.GA29262@embeddedor Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc2/hcd.h')
-rw-r--r--drivers/usb/dwc2/hcd.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/dwc2/hcd.h b/drivers/usb/dwc2/hcd.h
index 8ca6d12a6f57..1224fa9df604 100644
--- a/drivers/usb/dwc2/hcd.h
+++ b/drivers/usb/dwc2/hcd.h
@@ -199,7 +199,7 @@ struct dwc2_hcd_urb {
u32 flags;
u16 interval;
struct dwc2_hcd_pipe_info pipe_info;
- struct dwc2_hcd_iso_packet_desc iso_descs[0];
+ struct dwc2_hcd_iso_packet_desc iso_descs[];
};
/* Phases for control transfers */