[qemu-xen stable-4.19] target/s390x: Fix VSTL with a large length

[patchbot@xxxxxxx]

commit 62ac9cbb6fe2d088dd56cd258c61b033f610fe6f
Author:     Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
AuthorDate: Sat Aug 5 01:55:33 2023 +0200
Commit:     Michael Tokarev <mjt@xxxxxxxxxx>
CommitDate: Sun Sep 10 19:39:41 2023 +0300

    target/s390x: Fix VSTL with a large length
    
    The length is always truncated to 16 bytes. Do not probe more than
    that.
    
    Cc: qemu-stable@xxxxxxxxxx
    Fixes: 0e0a5b49ad58 ("s390x/tcg: Implement VECTOR STORE WITH LENGTH")
    Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
    Message-Id: <20230804235624.263260-1-iii@xxxxxxxxxxxxx>
    Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
    Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
    (cherry picked from commit 6db3518ba4fcddd71049718f138552999f0d97b4)
    Signed-off-by: Michael Tokarev <mjt@xxxxxxxxxx>
---
 target/s390x/tcg/vec_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/s390x/tcg/vec_helper.c b/target/s390x/tcg/vec_helper.c
index 48d86722b2..dafc4c3582 100644
--- a/target/s390x/tcg/vec_helper.c
+++ b/target/s390x/tcg/vec_helper.c
@@ -193,7 +193,7 @@ void HELPER(vstl)(CPUS390XState *env, const void *v1, 
uint64_t addr,
                   uint64_t bytes)
 {
     /* Probe write access before actually modifying memory */
-    probe_write_access(env, addr, bytes, GETPC());
+    probe_write_access(env, addr, MIN(bytes, 16), GETPC());
 
     if (likely(bytes >= 16)) {
         cpu_stq_data_ra(env, addr, s390_vec_read_element64(v1, 0), GETPC());
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#stable-4.19