diff options
| author | Keno Fischer <keno@juliacomputing.com> | 2018-06-07 12:17:22 +0200 |
|---|---|---|
| committer | Greg Kurz <groug@kaod.org> | 2018-06-07 12:17:22 +0200 |
| commit | a647502c582981c395b5d16e52a22ac7aff0fb2b (patch) | |
| tree | 0c523ce85c17bf164dba25bd35beef05e95a1b9f /hw | |
| parent | ec70b956fddf628ee2e42521c54362e80115a3c4 (diff) | |
9p: xattr: Fix crashes due to free of uninitialized value
If the size returned from llistxattr/lgetxattr is 0, we skipped
the malloc call, leaving xattr.value uninitialized. However, this
value is later passed to `g_free` without any further checks,
causing an error. Fix that by always calling g_malloc unconditionally.
If `size` is 0, it will return NULL, which is safe to pass to g_free.
Signed-off-by: Keno Fischer <keno@juliacomputing.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/9pfs/9p.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index d74302deeb..4386d69817 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -3256,8 +3256,8 @@ static void coroutine_fn v9fs_xattrwalk(void *opaque) xattr_fidp->fs.xattr.len = size; xattr_fidp->fid_type = P9_FID_XATTR; xattr_fidp->fs.xattr.xattrwalk_fid = true; + xattr_fidp->fs.xattr.value = g_malloc0(size); if (size) { - xattr_fidp->fs.xattr.value = g_malloc0(size); err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, xattr_fidp->fs.xattr.value, xattr_fidp->fs.xattr.len); @@ -3289,8 +3289,8 @@ static void coroutine_fn v9fs_xattrwalk(void *opaque) xattr_fidp->fs.xattr.len = size; xattr_fidp->fid_type = P9_FID_XATTR; xattr_fidp->fs.xattr.xattrwalk_fid = true; + xattr_fidp->fs.xattr.value = g_malloc0(size); if (size) { - xattr_fidp->fs.xattr.value = g_malloc0(size); err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, &name, xattr_fidp->fs.xattr.value, xattr_fidp->fs.xattr.len); |