From: David Howells <dhowells@xxxxxxxxxx>
commit 7cdfa44227b0d8842d46a775cebe4311150cb8f2 upstream.
Fix an overput in which filename_lookup() unconditionally drops a ref to
the filename it was given, but this isn't taken account of in the caller,
fs_lookup_param().
Addresses-Coverity-ID: 1443811 ("Use after free")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fs_parser.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -264,6 +264,7 @@ int fs_lookup_param(struct fs_context *f
return invalf(fc, "%s: not usable as path", param->key);
}
+ f->refcnt++; /* filename_lookup() drops our ref. */
ret = filename_lookup(param->dirfd, f, flags, _path, NULL);
if (ret < 0) {
errorf(fc, "%s: Lookup failure for '%s'", param->key, f->name);
