btrfs: Fix wild memory access in compression level parser

[BUG]
Kernel panic when mounting with "-o compress" mount option.
KASAN will report like:
------
==================================================================
BUG: KASAN: wild-memory-access in strncmp+0x31/0xc0
Read of size 1 at addr d86735fce994f800 by task mount/662
...
Call Trace:
 dump_stack+0xe3/0x175
 kasan_report+0x163/0x370
 __asan_load1+0x47/0x50
 strncmp+0x31/0xc0
 btrfs_compress_str2level+0x20/0x70 [btrfs]
 btrfs_parse_options+0xff4/0x1870 [btrfs]
 open_ctree+0x2679/0x49f0 [btrfs]
 btrfs_mount+0x1b7f/0x1d30 [btrfs]
 mount_fs+0x49/0x190
 vfs_kern_mount.part.29+0xba/0x280
 vfs_kern_mount+0x13/0x20
 btrfs_mount+0x31e/0x1d30 [btrfs]
 mount_fs+0x49/0x190
 vfs_kern_mount.part.29+0xba/0x280
 do_mount+0xaad/0x1a00
 SyS_mount+0x98/0xe0
 entry_SYSCALL_64_fastpath+0x1f/0xbe
------

[Cause]
For 'compress' and 'compress_force' options, its token doesn't expect
any parameter so its args[0] contains uninitialized data.
Accessing args[0] will cause above wild memory access.

[Fix]
For Opt_compress and Opt_compress_force, set compression level to
the default.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ set the default in advance ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 4a78e57..5982c8a 100644 (file)
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -1529,5 +1529,5 @@ unsigned int btrfs_compress_str2level(const char *str)
        if (str[4] == ':' && '1' <= str[5] && str[5] <= '9' && str[6] == 0)
                return str[5] - '0';
 
-       return 0;
+       return BTRFS_ZLIB_DEFAULT_LEVEL;
 }

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 93c5b82..0868cc5 100644 (file)
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -34,6 +34,8 @@
 /* Maximum size of data before compression */
 #define BTRFS_MAX_UNCOMPRESSED         (SZ_128K)
 
+#define        BTRFS_ZLIB_DEFAULT_LEVEL                3
+
 struct compressed_bio {
        /* number of bios pending for this compressed extent */
        refcount_t pending_bios;

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 65af029..ff3545e 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -507,9 +507,18 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
                            token == Opt_compress_force ||
                            strncmp(args[0].from, "zlib", 4) == 0) {
                                compress_type = "zlib";
+
                                info->compress_type = BTRFS_COMPRESS_ZLIB;
-                               info->compress_level =
-                                       btrfs_compress_str2level(args[0].from);
+                               info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL;
+                               /*
+                                * args[0] contains uninitialized data since
+                                * for these tokens we don't expect any
+                                * parameter.
+                                */
+                               if (token != Opt_compress &&
+                                   token != Opt_compress_force)
+                                       info->compress_level =
+                                         btrfs_compress_str2level(args[0].from);
                                btrfs_set_opt(info->mount_opt, COMPRESS);
                                btrfs_clear_opt(info->mount_opt, NODATACOW);
                                btrfs_clear_opt(info->mount_opt, NODATASUM);