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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: [email protected]
Signed-off-by: Jin Qian <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Jin Qian 2017-06-01 11:18:30 -07:00 • committed by Jaegeuk Kim
commit 21d3f8e1c3
1 changed files with 7 additions and 0 deletions
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7
fs/f2fs/segment.c
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@ -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;
}