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authorAl Viro <viro@zeniv.linux.org.uk>2021-01-31 14:40:40 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2021-02-23 10:25:28 -0500
commit9652c73246b980b9f2387916c35e02638d163472 (patch)
treedda4241b387d15af70c663e1107fec5fbf135d73 /fs/9p
parentb1adbdbda458b2ec69bf5915c4dcdbe2bd5e7bad (diff)
9p: fix misuse of sscanf() in v9fs_stat2inode()
1) sscanf() return value needs to be checked, damnit 2) sscanf() is perfectly capable of checking for fixed prefix, no need for that %13s + strncmp with constant string. 3) st->extension is a valid string; no need for voodoo with str*cpy() there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/9p')
-rw-r--r--fs/9p/vfs_inode.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 4a937fac1acb..58f6b56ef145 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1137,9 +1137,6 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
struct super_block *sb, unsigned int flags)
{
umode_t mode;
- char ext[32];
- char tag_name[14];
- unsigned int i_nlink;
struct v9fs_session_info *v9ses = sb->s_fs_info;
struct v9fs_inode *v9inode = V9FS_I(inode);
@@ -1157,18 +1154,18 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
inode->i_gid = stat->n_gid;
}
if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
- if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
+ if (v9fs_proto_dotu(v9ses)) {
+ unsigned int i_nlink;
/*
- * Hadlink support got added later to
- * to the .u extension. So there can be
- * server out there that doesn't support
- * this even with .u extension. So check
- * for non NULL stat->extension
+ * Hadlink support got added later to the .u extension.
+ * So there can be a server out there that doesn't
+ * support this even with .u extension. That would
+ * just leave us with stat->extension being an empty
+ * string, though.
*/
- strlcpy(ext, stat->extension, sizeof(ext));
/* HARDLINKCOUNT %u */
- sscanf(ext, "%13s %u", tag_name, &i_nlink);
- if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
+ if (sscanf(stat->extension,
+ " HARDLINKCOUNT %u", &i_nlink) == 1)
set_nlink(inode, i_nlink);
}
}