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fs/sysv: Null check to prevent null-ptr-deref bug 

commit ea2b62f305 upstream.

sb_getblk(inode->i_sb, parent) return a null ptr and taking lock on
that leads to the null-ptr-deref bug.

Reported-by: syzbot+aad58150cbc64ba41bdc@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=aad58150cbc64ba41bdc
Signed-off-by: Prince Kumar Maurya <princekumarmaurya06@gmail.com>
Message-Id: <20230531013141.19487-1-princekumarmaurya06@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prince Kumar Maurya 2023-05-30 18:31:41 -07:00 committed by Greg Kroah-Hartman
parent ccc6de4d4f
commit 1416eebaad
1 changed files with 4 additions and 0 deletions
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4
fs/sysv/itree.c
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@ -145,6 +145,10 @@ static int alloc_branch(struct inode *inode,
*/
parent = block_to_cpu(SYSV_SB(inode->i_sb), branch[n-1].key);
bh = sb_getblk(inode->i_sb, parent);
if (!bh) {
sysv_free_block(inode->i_sb, branch[n].key);
break;
}
lock_buffer(bh);
memset(bh->b_data, 0, blocksize);
branch[n].bh = bh;