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m68k: Avoid VLA use in mangle_kernel_stack()

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With gcc 7.3.0:

    arch/m68k/kernel/signal.c: In function ‘mangle_kernel_stack’:
    arch/m68k/kernel/signal.c:654:3: warning: ISO C90 forbids variable length array ‘buf’ [-Wvla]
       unsigned long buf[fsize / 2]; /* yes, twice as much */
       ^~~~~~~~

Replace the variable size by the upper limit, which is 168 bytes.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Geert Uytterhoeven
2019-01-06 11:47:00 +01:00
parent 9c0e91f6b7
commit 35f61d7b3b
1 changed files with 2 additions and 1 deletions
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arch/m68k/kernel/signal.c
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@@ -651,7 +651,8 @@ static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
regs->vector = formatvec & 0xfff; regs->vector = formatvec & 0xfff;
} else { } else {
struct switch_stack *sw = (struct switch_stack *)regs - 1; struct switch_stack *sw = (struct switch_stack *)regs - 1;
unsigned long buf[fsize / 2]; /* yes, twice as much */ /* yes, twice as much as max(sizeof(frame.un.fmt<x>)) */
unsigned long buf[sizeof(((struct frame *)0)->un) / 2];
/* that'll make sure that expansion won't crap over data */ /* that'll make sure that expansion won't crap over data */
if (copy_from_user(buf + fsize / 4, fp, fsize)) if (copy_from_user(buf + fsize / 4, fp, fsize))