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vfs: Fix refcounting of filenames in fs_parser

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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>
This commit is contained in:
David Howells 2019-03-25 16:38:22 +00:00 committed by Al Viro
parent c3aabf0780
commit 7cdfa44227
1 changed files with 1 additions and 0 deletions
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fs/fs_parser.c
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@ -268,6 +268,7 @@ 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);