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05 April 2024, 19:05:47 UTC
Revision ce85cfbed6fe3dbc01bd1976b23ac3e97878cde6 authored by Benjamin Coddington on 21 April 2015, 18:17:35 UTC, committed by Trond Myklebust on 23 April 2015, 19:16:15 UTC 
NFS: Don't attempt to decode missing directory entries
 
If a READDIR reply comes back without any page data, avoid a NULL pointer
dereference in xdr_copy_to_scratch().

BUG: unable to handle kernel NULL pointer dereference at 0000000000000001
IP: [<ffffffff813a378d>] memcpy+0xd/0x110
...
Call Trace:
	? xdr_inline_decode+0x7a/0xb0 [sunrpc]
	nfs3_decode_dirent+0x73/0x320 [nfsv3]
	nfs_readdir_page_filler+0xd5/0x4e0 [nfs]
	? nfs3_rpc_wrapper.constprop.9+0x42/0xc0 [nfsv3]
	nfs_readdir_xdr_to_array+0x1fa/0x330 [nfs]
	? mem_cgroup_commit_charge+0xac/0x160
	? nfs_readdir_xdr_to_array+0x330/0x330 [nfs]
	nfs_readdir_filler+0x22/0x90 [nfs]
	do_read_cache_page+0x7e/0x1a0
	read_cache_page+0x1c/0x20
	nfs_readdir+0x18e/0x660 [nfs]
	? nfs3_xdr_dec_getattr3res+0x80/0x80 [nfsv3]
	iterate_dir+0x97/0x130
	SyS_getdents+0x94/0x120
	? fillonedir+0xd0/0xd0
	system_call_fastpath+0x12/0x17

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
1 parent 3708f84
History
Tip revision: ce85cfbed6fe3dbc01bd1976b23ac3e97878cde6 authored by Benjamin Coddington on 21 April 2015, 18:17:35 UTC
NFS: Don't attempt to decode missing directory entries
Tip revision: ce85cfb
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.gitignore -rw-r--r-- 1.2 KB
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COPYING -rw-r--r-- 18.3 KB
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Kbuild -rw-r--r-- 2.1 KB
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MAINTAINERS -rw-r--r-- 298.2 KB
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README -rw-r--r-- 18.3 KB
REPORTING-BUGS -rw-r--r-- 7.3 KB

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