[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH] target-mips: fix resource leak reported by Coverity
From: |
Leon Alrae |
Subject: |
[Qemu-devel] [PATCH] target-mips: fix resource leak reported by Coverity |
Date: |
Tue, 14 Jul 2015 11:08:15 +0100 |
UHI assert and link operations call lock_user_string() twice to obtain two
strings pointed by gpr[4] and gpr[5]. If the second lock_user_string()
fails, then the first one won't get freed. Fix this by introducing another
macro responsible for obtaining two strings and handling allocation
failure.
Signed-off-by: Leon Alrae <address@hidden>
---
target-mips/mips-semi.c | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/target-mips/mips-semi.c b/target-mips/mips-semi.c
index 1162c76..5050940 100644
--- a/target-mips/mips-semi.c
+++ b/target-mips/mips-semi.c
@@ -220,6 +220,23 @@ static int copy_argn_to_target(CPUMIPSState *env, int
arg_num,
} \
} while (0)
+#define GET_TARGET_STRINGS_2(p, addr, p2, addr2) \
+ do { \
+ p = lock_user_string(addr); \
+ if (!p) { \
+ gpr[2] = -1; \
+ gpr[3] = EFAULT; \
+ goto uhi_done; \
+ } \
+ p2 = lock_user_string(addr2); \
+ if (!p2) { \
+ unlock_user(p, addr, 0); \
+ gpr[2] = -1; \
+ gpr[3] = EFAULT; \
+ goto uhi_done; \
+ } \
+ } while (0)
+
#define FREE_TARGET_STRING(p, gpr) \
do { \
unlock_user(p, gpr, 0); \
@@ -322,8 +339,7 @@ void helper_do_semihosting(CPUMIPSState *env)
FREE_TARGET_STRING(p, gpr[4]);
break;
case UHI_assert:
- GET_TARGET_STRING(p, gpr[4]);
- GET_TARGET_STRING(p2, gpr[5]);
+ GET_TARGET_STRINGS_2(p, gpr[4], p2, gpr[5]);
printf("assertion '");
printf("\"%s\"", p);
printf("': file \"%s\", line %d\n", p2, (int)gpr[6]);
@@ -341,8 +357,7 @@ void helper_do_semihosting(CPUMIPSState *env)
break;
#ifndef _WIN32
case UHI_link:
- GET_TARGET_STRING(p, gpr[4]);
- GET_TARGET_STRING(p2, gpr[5]);
+ GET_TARGET_STRINGS_2(p, gpr[4], p2, gpr[5]);
gpr[2] = link(p, p2);
gpr[3] = errno_mips(errno);
FREE_TARGET_STRING(p2, gpr[5]);
--
2.1.0