haraldwolff/qemu-patch-raspberry4
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9pfs: check return value of v9fs_co_name_to_path()

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These v9fs_co_name_to_path() call sites have always been around. I guess
no care was taken to check the return value because the name_to_path
operation could never fail at the time. This is no longer true: the
handle and synth backends can already fail this operation, and so will the
local backend soon.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Greg Kurz 2017-05-25 10:30:14 +02:00
parent fcdcf1eed2
commit 4fa62005d0
1 changed files with 25 additions and 11 deletions
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36
hw/9pfs/9p.c
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@ -2571,7 +2571,10 @@ static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
err = -EINVAL;
goto out;
}
v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
if (err < 0) {
goto out;
}
} else {
old_name = fidp->path.data;
end = strrchr(old_name, '/');
@ -2583,8 +2586,11 @@ static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
new_name = g_malloc0(end - old_name + name->size + 1);
strncat(new_name, old_name, end - old_name);
strncat(new_name + (end - old_name), name->data, name->size);
v9fs_co_name_to_path(pdu, NULL, new_name, &new_path);
err = v9fs_co_name_to_path(pdu, NULL, new_name, &new_path);
g_free(new_name);
if (err < 0) {
goto out;
}
}
err = v9fs_co_rename(pdu, &fidp->path, &new_path);
if (err < 0) {
@ -2664,20 +2670,26 @@ out_nofid:
v9fs_string_free(&name);
}
static void coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
V9fsString *old_name,
V9fsPath *newdir,
V9fsString *new_name)
static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
V9fsString *old_name,
V9fsPath *newdir,
V9fsString *new_name)
{
V9fsFidState *tfidp;
V9fsPath oldpath, newpath;
V9fsState *s = pdu->s;
int err;
v9fs_path_init(&oldpath);
v9fs_path_init(&newpath);
v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
if (err < 0) {
goto out;
}
/*
* Fixup fid's pointing to the old name to
@ -2689,8 +2701,10 @@ static void coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
}
}
out:
v9fs_path_free(&oldpath);
v9fs_path_free(&newpath);
return err;
}
static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
@ -2724,8 +2738,8 @@ static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
}
if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
/* Only for path based fid we need to do the below fixup */
v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
&newdirfidp->path, new_name);
err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
&newdirfidp->path, new_name);
}
out:
if (olddirfidp) {