Make use of get_full_path_helper() instead of sprintf.
Signed-off-by: G. Campana <gcampana+kvm@xxxxxxxxxxxxx>
---
virtio/9p.c | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/virtio/9p.c b/virtio/9p.c
index b611643..09da7f3 100644
--- a/virtio/9p.c
+++ b/virtio/9p.c
@@ -91,15 +91,6 @@ static struct p9_fid *get_fid(struct p9_dev *p9dev, int fid)
return new;
}
-/* Warning: Immediately use value returned from this function */
-static const char *rel_to_abs(struct p9_dev *p9dev,
- const char *path, char *abs_path)
-{
- sprintf(abs_path, "%s/%s", p9dev->root_dir, path);
-
- return abs_path;
-}
-
static void stat2qid(struct stat *st, struct p9_qid *qid)
{
*qid = (struct p9_qid) {
@@ -269,6 +260,19 @@ static int get_full_path(char *full_path, size_t size, struct p9_fid *fid,
return get_full_path_helper(full_path, size, fid->abs_path, name);
}
+static int stat_rel(struct p9_dev *p9dev, const char *path, struct stat *st)
+{
+ char full_path[PATH_MAX];
+
+ if (get_full_path_helper(full_path, sizeof(full_path), p9dev->root_dir, path) != 0)
+ return -1;
+
+ if (lstat(full_path, st) != 0)
+ return -1;
+
+ return 0;
+}
+
static void virtio_p9_open(struct p9_dev *p9dev,
struct p9_pdu *pdu, u32 *outlen)
{
@@ -443,7 +447,6 @@ static void virtio_p9_walk(struct p9_dev *p9dev,
for (i = 0; i < nwname; i++) {
struct stat st;
char tmp[PATH_MAX] = {0};
- char full_path[PATH_MAX];
char *str;
int ret;
@@ -458,7 +461,7 @@ static void virtio_p9_walk(struct p9_dev *p9dev,
free(str);
- if (lstat(rel_to_abs(p9dev, tmp, full_path), &st) < 0)
+ if (stat_rel(p9dev, tmp, &st) != 0)
goto err_out;
stat2qid(&st, &wqid);
@@ -612,7 +615,6 @@ static void virtio_p9_readdir(struct p9_dev *p9dev,
struct stat st;
struct p9_fid *fid;
struct dirent *dent;
- char full_path[PATH_MAX];
u64 offset, old_offset;
rcount = 0;
@@ -643,7 +645,8 @@ static void virtio_p9_readdir(struct p9_dev *p9dev,
break;
}
old_offset = dent->d_off;
- lstat(rel_to_abs(p9dev, dent->d_name, full_path), &st);
+ if (stat_rel(p9dev, dent->d_name, &st) != 0)
+ memset(&st, -1, sizeof(st));
stat2qid(&st, &qid);
read = pdu->write_offset;
virtio_p9_pdu_writef(pdu, "Qqbs", &qid, dent->d_off,
--
2.7.4
--
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