[mini-os master] Mini-OS: fix 9pfs response receiving

[patchbot@xxxxxxx]

commit b08019f0b2fbc30c75169a160acb9fd9af5d68f4
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Nov 21 10:49:53 2023 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Nov 21 21:05:11 2023 +0000

    Mini-OS: fix 9pfs response receiving
    
    When copying a 9pfs response chunk from the ring buffer across the
    ring end, the local ring pointer and length field are not updated
    correctly. Fix that.
    
    Fixes: 0924fec1de58 ("Mini-OS: add 9pfs transport layer")
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
---
 9pfront.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/9pfront.c b/9pfront.c
index 43c7409..35c5552 100644
--- a/9pfront.c
+++ b/9pfront.c
@@ -386,7 +386,9 @@ static void copy_bufs(unsigned char **buf1, unsigned char 
**buf2,
             printk("9pfs: short copy (dropping %u bytes)\n", len - *len1);
             len = *len1;
         }
-        memcpy(target, *buf1, *len1);
+        memcpy(target, *buf1, len);
+        *buf1 += len;
+        *len1 -= len;
     }
 }
 
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generated by git-patchbot for /home/xen/git/mini-os.git#master