diff options
| author |   Jim Meyering <meyering@redhat.com> | 2012-08-22 13:55:55 +0200 |
|---|---|---|
| committer |   Michael Roth <mdroth@linux.vnet.ibm.com> | 2012-08-28 01:50:02 -0500 |
| commit | cc5caf7df4ed5833183121e08c6b6131722137d5 (patch) | |
| tree | a8dc4bb0f4069de1c22c01e73c034c0b413f5be5 | |
| parent | b68e45c68667dce43341c94c69126852496ddbaf (diff) | |
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>
(cherry picked from commit 396bef4b3846bf4e80a2bee38e9a2d8554d0f251)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -rw-r--r-- | arm-semi.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arm-semi.c b/arm-semi.c index 88ca9bb1b..5d2a2d227 100644 --- a/arm-semi.c +++ b/arm-semi.c @@ -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)); } |