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FROMLIST: f2fs: sanity check size of nat and sit cache

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Make sure number of entires doesn't exceed max journal size.

Cc: stable@vger.kernel.org
Signed-off-by: Jin Qian <jinqian@android.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

(url 35872032)
Bug: 36819470
Change-Id: I94ad46eb3586cfcdd5f477a6caa2244b7d05da56
This commit is contained in:
Jin Qian 2017-06-01 11:18:30 -07:00 • committed by Jin Qian
parent a2f057876a
commit 18bf691e44
1 changed files with 7 additions and 0 deletions
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7
fs/f2fs/segment.c
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@ -1805,6 +1805,8 @@ 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;
@ -1831,6 +1833,11 @@ 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;
}