diff options
Diffstat (limited to 'semihosting')
| -rw-r--r-- | semihosting/arm-compat-semi.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c index d12288fc80..e741674238 100644 --- a/semihosting/arm-compat-semi.c +++ b/semihosting/arm-compat-semi.c @@ -504,16 +504,25 @@ void do_common_semihosting(CPUState *cs) GET_ARG(1); GET_ARG(2); len = asprintf(&s, "/tmp/qemu-%x%02x", getpid(), (int)arg1 & 0xff); + if (len < 0) { + common_semi_set_ret(cs, -1); + break; + } + + /* Allow for trailing NUL */ + len++; /* Make sure there's enough space in the buffer */ - if (len < 0 || len >= arg2) { + if (len > arg2) { + free(s); common_semi_set_ret(cs, -1); break; } p = lock_user(VERIFY_WRITE, arg0, len, 0); if (!p) { + free(s); goto do_fault; } - memcpy(p, s, len + 1); + memcpy(p, s, len); unlock_user(p, arg0, len); free(s); common_semi_set_ret(cs, 0); |