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| author | David Howells <dhowells@redhat.com> | 2019-03-25 16:38:31 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-09-12 21:06:14 -0400 |
| commit | 74983ac20aeafc88d9ceed64a8bf2a9024c488d5 (patch) | |
| tree | b36666d741153e2a86f641f109d26e6735514a24 /fs/fs_parser.c | |
| parent | f32356261d44d580649a7abce1156d15d49cf20f (diff) | |
| download | linux-74983ac20aeafc88d9ceed64a8bf2a9024c488d5.tar.gz linux-74983ac20aeafc88d9ceed64a8bf2a9024c488d5.tar.bz2 linux-74983ac20aeafc88d9ceed64a8bf2a9024c488d5.zip | |
vfs: Make fs_parse() handle fs_param_is_fd-type params better
Make fs_parse() handle fs_param_is_fd-type parameters that are passed a
string by converting it to an integer (in addition to handling direct fd
specification).
Also range check the integer.
[fix from Yin Fengwei folded]
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/fs_parser.c')
| -rw-r--r-- | fs/fs_parser.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/fs/fs_parser.c b/fs/fs_parser.c index 460ea4206fa2..d1930adce68d 100644 --- a/fs/fs_parser.c +++ b/fs/fs_parser.c @@ -204,9 +204,23 @@ int fs_parse(struct fs_context *fc, goto okay; case fs_param_is_fd: { - if (param->type != fs_value_is_file) + switch (param->type) { + case fs_value_is_string: + if (!result->has_value) + goto bad_value; + + ret = kstrtouint(param->string, 0, &result->uint_32); + break; + case fs_value_is_file: + result->uint_32 = param->dirfd; + ret = 0; + default: goto bad_value; - goto okay; + } + + if (result->uint_32 > INT_MAX) + goto bad_value; + goto maybe_okay; } case fs_param_is_blockdev: |