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| author | David Howells <dhowells@redhat.com> | 2019-03-25 16:38:22 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-21 07:18:51 +0200 |
| commit | 12434939ba58717e0259ffe7375f9aa7a5f1c0b8 (patch) | |
| tree | edb43f7251356d938ca6ed6f37fec2521342880c | |
| parent | d4911cc1f4b663f5a19707610aa7623d9f94c78a (diff) | |
vfs: Fix refcounting of filenames in fs_parser
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@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/fs_parser.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/fs_parser.c b/fs/fs_parser.c index 0d388faa25d1..460ea4206fa2 100644 --- a/fs/fs_parser.c +++ b/fs/fs_parser.c @@ -264,6 +264,7 @@ int fs_lookup_param(struct fs_context *fc, 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); |