| Message ID | 1520400451-11475-2-git-send-email-me@tobin.cc (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/include/linux/vla.h b/include/linux/vla.h new file mode 100644 index 000000000000..ca0510d5e416 --- /dev/null +++ b/include/linux/vla.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_VLA_H +#define _LINUX_VLA_H + +#define VLA_DEFAULT_MAX 256 + +/* evaluates 'size' and 'max' twice */ +#define VLA_SAFE(type, vla, size, max) type vla[(size) < (max) ? (size) : (max)] + +#define VLA_WARN_OVERSIZE(vla, size) \ +do { \ + WARN(sizeof(vla) < size, "vla maximum exceeded\n"); \ +} while (0) + +#endif /* _LINUX_VLA_H */
We would like to get rid of VLAs all together but in the mean time we can make their usage safer. Define a macro to use for declaring a VLA. Macro includes requested 'size' and 'max' allowed. Macro allocates storage for an array equivalent to int array[min(size, max)]; We also define a macro to check whether maximum size was reached. Signed-off-by: Tobin C. Harding <me@tobin.cc> --- include/linux/vla.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 include/linux/vla.h