[Qemu-devel] [PATCH] linux-user: fix undefined shift in copy_to_user_fdset

[Andreas Schwab <schwab@suse.de>]

If TARGET_ABI_BITS is bigger than 32 we shift by more than the size of int.

Signed-off-by: Andreas Schwab <schwab@suse.de>
---
 linux-user/syscall.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fa3039f..5abc16f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -922,7 +922,7 @@ static inline abi_long copy_to_user_fdset(abi_ulong target_fds_addr,
     for (i = 0; i < nw; i++) {
         v = 0;
         for (j = 0; j < TARGET_ABI_BITS; j++) {
-            v |= ((FD_ISSET(k, fds) != 0) << j);
+            v |= ((abi_ulong)(FD_ISSET(k, fds) != 0) << j);
             k++;
         }
         __put_user(v, &target_fds[i]);
-- 
1.8.2.1

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
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