diff options
| author | Roman Smirnov <r.smirnov@omp.ru> | 2025-09-07 10:58:14 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-09 18:45:25 +0200 |
| commit | 64ddb14fd034300c3729fea5847e674ee9fb3f24 (patch) | |
| tree | a2d0825401f54c5ce56e23b9c293ca503e681b4c | |
| parent | 071fdf70d9290425bd84e44021a450328c95cbe5 (diff) | |
cifs: fix integer overflow in match_server()
[ Upstream commit 2510859475d7f46ed7940db0853f3342bf1b65ee ]
The echo_interval is not limited in any way during mounting,
which makes it possible to write a large number to it. This can
cause an overflow when multiplying ctx->echo_interval by HZ in
match_server().
Add constraints for echo_interval to smb3_fs_context_parse_param().
Found by Linux Verification Center (linuxtesting.org) with Svace.
Fixes: adfeb3e00e8e1 ("cifs: Make echo interval tunable")
Cc: stable@vger.kernel.org
Signed-off-by: Roman Smirnov <r.smirnov@omp.ru>
Signed-off-by: Steve French <stfrench@microsoft.com>
[ Adapted to older CIFS filesystem structure and mount option parsing ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/cifs/connect.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 2c0522d97e03..5fc418f9210a 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1915,6 +1915,11 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, __func__); goto cifs_parse_mount_err; } + if (option < SMB_ECHO_INTERVAL_MIN || + option > SMB_ECHO_INTERVAL_MAX) { + cifs_dbg(VFS, "echo interval is out of bounds\n"); + goto cifs_parse_mount_err; + } vol->echo_interval = option; break; case Opt_snapshot: |