From: bugzilla-daemon@bugzilla.kernel.org
To: linux-xfs@kernel.org
Subject: [Bug 200925] New: null pointer dereference in xfs_dir_isempty()
Date: Fri, 24 Aug 2018 13:35:47 +0000 [thread overview]
Message-ID: <bug-200925-201763@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=200925
Bug ID: 200925
Summary: null pointer dereference in xfs_dir_isempty()
Product: File System
Version: 2.5
Kernel Version: 4.18
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: XFS
Assignee: filesystem_xfs@kernel-bugs.kernel.org
Reporter: wen.xu@gatech.edu
Regression: No
Created attachment 278069
--> https://bugzilla.kernel.org/attachment.cgi?id=278069&action=edit
poc.c
- Reproduce
# mkdir mnt
# mount -t xfs 79.img mnt
# gcc 79.c
# ./a.out ./mnt
- Kernel message
Check attachment: 79.log
- Reason
https://elixir.bootlin.com/linux/latest/source/fs/xfs/libxfs/xfs_dir2.c#L185
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
return !sfp->count;
Missing checks on sfp.
Reported by Wen Xu (wen.xu@gatech.edu) from SSLab.
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next reply other threads:[~2018-08-24 17:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-24 13:35 bugzilla-daemon [this message]
2018-08-24 13:36 ` [Bug 200925] null pointer dereference in xfs_dir_isempty() bugzilla-daemon
2018-08-24 13:36 ` bugzilla-daemon
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