From 21d3f8e1c3b7996ce239ab6fa82e9f7a8c47d84d Mon Sep 17 00:00:00 2001 From: Jin Qian Date: Thu, 1 Jun 2017 11:18:30 -0700 Subject: [PATCH] f2fs: sanity check size of nat and sit cache Make sure number of entires doesn't exceed max journal size. Cc: stable@vger.kernel.org Signed-off-by: Jin Qian Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/segment.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index c1026b78cdfc..a739803b6513 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2495,6 +2495,8 @@ static int read_normal_summaries(struct f2fs_sb_info *sbi, int type) static int restore_curseg_summaries(struct f2fs_sb_info *sbi) { + struct f2fs_journal *sit_j = CURSEG_I(sbi, CURSEG_COLD_DATA)->journal; + struct f2fs_journal *nat_j = CURSEG_I(sbi, CURSEG_HOT_DATA)->journal; int type = CURSEG_HOT_DATA; int err; @@ -2521,6 +2523,11 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi) return err; } + /* sanity check for summary blocks */ + if (nats_in_cursum(nat_j) > NAT_JOURNAL_ENTRIES || + sits_in_cursum(sit_j) > SIT_JOURNAL_ENTRIES) + return -EINVAL; + return 0; } -- 2.11.0