CVE-2021-47340

In the Linux kernel, the following vulnerability has been resolved:

jfs: fix GPF in diFree

Avoid passing inode with JFS_SBI(inode->i_sb)->ipimap == NULL to diFree()[1]. GFP will appear:

struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
struct inomap *imap = JFS_IP(ipimap)->i_imap;

JFS_IP() will return invalid pointer when ipimap == NULL

Call Trace: diFree+0x13d/0x2dc0 fs/jfs/jfs_imap.c:853 [1] jfs_evict_inode+0x2c9/0x370 fs/jfs/inode.c:154 evict+0x2ed/0x750 fs/inode.c:578 iput_final fs/inode.c:1654 [inline] iput.part.0+0x3fe/0x820 fs/inode.c:1680 iput+0x58/0x70 fs/inode.c:1670

Affected Software

References

• https://git.kernel.org/stable/c/3bb27e27240289b47d3466f647a55c567adbdc3a
• https://git.kernel.org/stable/c/42f102ea1943ecb10a0756bf75424de5d1d5beed
• https://git.kernel.org/stable/c/49def1b0644892e3b113673c13d650c3060b43bc
• https://git.kernel.org/stable/c/745c9a59422c63f661f4374ed5181740db4130a1
• https://git.kernel.org/stable/c/7bde24bde490f3139eee147efc6d60d6040fe975
• https://git.kernel.org/stable/c/8018936950360f1c503bb385e158cfc5e4945d18
• https://git.kernel.org/stable/c/9d574f985fe33efd6911f4d752de6f485a1ea732
• https://git.kernel.org/stable/c/a21e5cb1a64c904f1f0ef7b2d386fc7d2b1d2ce2
• https://git.kernel.org/stable/c/aff8d95b69051d0cf4acc3d91f22299fdbb9dfb3