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[PULL 1/1] 9pfs: Fix divide by zero bug
From: |
Greg Kurz |
Subject: |
[PULL 1/1] 9pfs: Fix divide by zero bug |
Date: |
Sat, 23 Nov 2019 17:59:15 +0100 |
From: Dan Schatzberg <address@hidden>
Some filesystems may return 0s in statfs (trivially, a FUSE filesystem
can do so). QEMU should handle this gracefully and just behave the
same as if statfs failed.
Signed-off-by: Dan Schatzberg <address@hidden>
Acked-by: Christian Schoenebeck <address@hidden>
Signed-off-by: Greg Kurz <address@hidden>
---
hw/9pfs/9p.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 37abcdb71ec0..520177f40c17 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -1834,8 +1834,10 @@ static int32_t coroutine_fn get_iounit(V9fsPDU *pdu,
V9fsPath *path)
* and as well as less than (client msize - P9_IOHDRSZ))
*/
if (!v9fs_co_statfs(pdu, path, &stbuf)) {
- iounit = stbuf.f_bsize;
- iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
+ if (stbuf.f_bsize) {
+ iounit = stbuf.f_bsize;
+ iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize;
+ }
}
if (!iounit) {
iounit = s->msize - P9_IOHDRSZ;
--
2.21.0