[Qemu-devel] [PATCH] linux-user: Fix array bounds in errno conversion

[riku . voipio]

From: Riku Voipio <riku.voi...@linaro.org>

Check array bounds in host_to_target_errno() and target_to_host_errno().

Originally from Timothy Edward Baldwin, checks improved by Riku

Cc: Timothy Edward Baldwin <t.e.baldwi...@members.leeds.ac.uk>
Signed-off-by: Riku Voipio <riku.voi...@linaro.org>
---
 linux-user/syscall.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 06a59b4..100a111 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -614,17 +614,19 @@ static uint16_t 
host_to_target_errno_table[ERRNO_TABLE_SIZE] = {
 #endif
 };
 
-static inline int host_to_target_errno(int err)
+static inline unsigned int host_to_target_errno(unsigned int err)
 {
-    if(host_to_target_errno_table[err])
+    if(err < ERRNO_TABLE_SIZE && host_to_target_errno_table[err]) {
         return host_to_target_errno_table[err];
+    }
     return err;
 }
 
-static inline int target_to_host_errno(int err)
+static inline unsigned int target_to_host_errno(unsigned int err)
 {
-    if (target_to_host_errno_table[err])
+    if (err < ERRNO_TABLE_SIZE && target_to_host_errno_table[err]) {
         return target_to_host_errno_table[err];
+    }
     return err;
 }
 
-- 
2.6.1