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target-mips: fix resource leak reported by Coverity

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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 <leon.alrae@imgtec.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Leon Alrae 2015-07-14 11:08:15 +01:00
parent 47ada0ad34
commit 26e7e982b2
1 changed files with 19 additions and 4 deletions
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23
target-mips/mips-semi.c
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@ -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]);