f2fs: avoid potential int overflow in sanity_check_area_boundary()

While calculating the end addresses of main area and segment 0, u32
may be not enough to hold the result without the danger of int
overflow.

Just in case, play it safe and cast one of the operands to a
wider type (u64).

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: fd694733d523 ("f2fs: cover large section in sanity check of super")
Cc: stable@vger.kernel.org
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 3959fd137cc9b1befb79849659bf4870f2706e64..4d8f38ca6fcd9a7ef470840ed6997c21369c34b2 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3356,9 +3356,9 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
        u32 segment_count = le32_to_cpu(raw_super->segment_count);
        u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
        u64 main_end_blkaddr = main_blkaddr +
-                               (segment_count_main << log_blocks_per_seg);
+                               ((u64)segment_count_main << log_blocks_per_seg);
        u64 seg_end_blkaddr = segment0_blkaddr +
-                               (segment_count << log_blocks_per_seg);
+                               ((u64)segment_count << log_blocks_per_seg);
 
        if (segment0_blkaddr != cp_blkaddr) {
                f2fs_info(sbi, "Mismatch start address, segment0(%u) cp_blkaddr(%u)",