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fs: jfs: fix shift-out-of-bounds in dbDiscardAG

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This should be applied to most URSAN bugs found recently by syzbot,
by guarding the dbMount. As syzbot feeding rubbish into the bmap
descriptor.

Signed-off-by: Hoi Pok Wu <wuhoipok@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
This commit is contained in:
Hoi Pok Wu 2022-10-25 23:20:45 +08:00 • committed by Dave Kleikamp
parent ebe060369f
commit 25e70c6162
1 changed files with 5 additions and 0 deletions
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5
fs/jfs/jfs_dmap.c
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@ -198,6 +198,11 @@ int dbMount(struct inode *ipbmap)
goto err_release_metapage;
}
if (((bmp->db_mapsize - 1) >> bmp->db_agl2size) > MAXAG) {
err = -EINVAL;
goto err_release_metapage;
}
for (i = 0; i < MAXAG; i++)
bmp->db_agfree[i] = le64_to_cpu(dbmp_le->dn_agfree[i]);
bmp->db_agsize = le64_to_cpu(dbmp_le->dn_agsize);