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Error on invalid b instruction (#6109)

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If label resolves to an offset of 0, assume instruction invalid
This commit is contained in:
Sven Steinbauer 2016-11-03 23:34:56 +00:00 committed by radare
parent 7bf7ff3fad
commit 80da50f31f
1 changed files with 4 additions and 0 deletions
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4
libr/asm/arch/arm/armass.c
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@ -421,6 +421,10 @@ static int thumb_assemble(ArmOpcode *ao, ut64 off, const char *str) {
} else
if (!strcmpnull (ao->op, "b") || !strcmpnull (ao->op, "b.n")) {
//uncond branch : PC += 4 + (delta*2)
int offset = getnum (ao->a[0]);
if (offset == 0) {
return 0;
}
int delta = getnum (ao->a[0]) - 4 - ao->off;
if ((delta < -2048) || (delta > 2046) || (delta & 1)) {
eprintf("branch out of range or not even\n");