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Fixed buffer overflow bug in "dis".

This commit is contained in:
Daniel Beer 2010-08-10 14:03:56 +12:00
parent 5994804181
commit bc992661cf
1 changed files with 12 additions and 3 deletions
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15
devcmd.c
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@ -263,7 +263,7 @@ static int cmd_dis(cproc_t cp, char **arg)
char *len_text = get_arg(arg);
address_t offset = 0;
address_t length = 0x40;
uint8_t buf[4096];
uint8_t *buf;
if (!off_text) {
fprintf(stderr, "dis: offset must be specified\n");
@ -285,10 +285,19 @@ static int cmd_dis(cproc_t cp, char **arg)
length = 0x10000 - offset;
}
if (dev->readmem(dev, offset, buf, length) < 0)
buf = malloc(length);
if (!buf) {
perror("dis: couldn't allocate memory");
return -1;
}
cproc_disassemble(cp, offset, (uint8_t *)buf, length);
if (dev->readmem(dev, offset, buf, length) < 0) {
free(buf);
return -1;
}
cproc_disassemble(cp, offset, buf, length);
free(buf);
return 0;
}