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authorJin Qian <jinqian@google.com>2017-04-25 16:28:48 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-14 13:32:59 +0200
commit4edbdf57bc26a126aa3cbafd63fae4b00e002e2d (patch)
treee7fb8fbe05b6d01be820050dfb39db3c34895c91
parent9456239483424c55b86671c9ac19b4152a0c360c (diff)
f2fs: sanity check segment count
commit b9dd46188edc2f0d1f37328637860bb65a771124 upstream. F2FS uses 4 bytes to represent block address. As a result, supported size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. Signed-off-by: Jin Qian <jinqian@google.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/f2fs/super.c7
-rw-r--r--include/linux/f2fs_fs.h6
2 files changed, 13 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 16462e702f96..86e1cb899957 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1059,6 +1059,13 @@ static int sanity_check_raw_super(struct super_block *sb,
return 1;
}
+ if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {
+ f2fs_msg(sb, KERN_INFO,
+ "Invalid segment count (%u)",
+ le32_to_cpu(raw_super->segment_count));
+ return 1;
+ }
+
/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
if (sanity_check_area_boundary(sb, raw_super))
return 1;
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 25c6324a0dd0..3d6e6ce44c5c 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -284,6 +284,12 @@ struct f2fs_nat_block {
#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
/*
+ * F2FS uses 4 bytes to represent block address. As a result, supported size of
+ * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
+ */
+#define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
+
+/*
* Note that f2fs_sit_entry->vblocks has the following bit-field information.
* [15:10] : allocation type such as CURSEG_XXXX_TYPE
* [9:0] : valid block count