5.4-stable review patch. If anyone has any objections, please let me know.
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From: Jeongjun Park aha310510@gmail.com
[ Upstream commit f73f969b2eb39ad8056f6c7f3a295fa2f85e313a ]
Reported-by: syzbot+241c815bda521982cb49@syzkaller.appspotmail.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Jeongjun Park aha310510@gmail.com Signed-off-by: Dave Kleikamp dave.kleikamp@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/jfs/jfs_imap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c index b0965f3ef1865..36ed756820648 100644 --- a/fs/jfs/jfs_imap.c +++ b/fs/jfs/jfs_imap.c @@ -292,7 +292,7 @@ int diSync(struct inode *ipimap) int diRead(struct inode *ip) { struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb); - int iagno, ino, extno, rc; + int iagno, ino, extno, rc, agno; struct inode *ipimap; struct dinode *dp; struct iag *iagp; @@ -341,8 +341,11 @@ int diRead(struct inode *ip)
/* get the ag for the iag */ agstart = le64_to_cpu(iagp->agstart); + agno = BLKTOAG(agstart, JFS_SBI(ip->i_sb));
release_metapage(mp); + if (agno >= MAXAG || agno < 0) + return -EIO;
rel_inode = (ino & (INOSPERPAGE - 1)); pageno = blkno >> sbi->l2nbperpage;