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arm-semi: don't leak 1KB user string lock buffer upon TARGET_SYS_OPEN 

Always call unlock_user before returning.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jim Meyering 2012-08-22 13:55:55 +02:00 committed by Anthony Liguori
parent a7e47d4bfc
commit 396bef4b38
1 changed files with 7 additions and 6 deletions
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13
target-arm/arm-semi.c
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@ -194,18 +194,19 @@ uint32_t do_arm_semihosting(CPUARMState *env)
if (!(s = lock_user_string(ARG(0))))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
if (ARG(1) >= 12)
if (ARG(1) >= 12) {
unlock_user(s, ARG(0), 0);
return (uint32_t)-1;
}
if (strcmp(s, ":tt") == 0) {
if (ARG(1) < 4)
return STDIN_FILENO;
else
return STDOUT_FILENO;
int result_fileno = ARG(1) < 4 ? STDIN_FILENO : STDOUT_FILENO;
unlock_user(s, ARG(0), 0);
return result_fileno;
}
if (use_gdb_syscalls()) {
gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
(int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
return env->regs[0];
ret = env->regs[0];
} else {
ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
}