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9p: do not trust pdu content for stat item size

Browse source 
v9fs_dir_readdir() could deadloop if a struct was sent with a size set
to -2

Link: http://lkml.kernel.org/r/[email protected]
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=88021
Signed-off-by: Gertjan Halkes <[email protected]>
Signed-off-by: Dominique Martinet <[email protected]>
This commit is contained in:
Gertjan Halkes 2018-09-05 15:41:29 +09:00 • committed by Dominique Martinet
commit 2803cf4379
2 changed files with 5 additions and 6 deletions
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3
net/9p/protocol.c
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@ -571,9 +571,10 @@ int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st)
if (ret) {
p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
trace_9p_protocol_dump(clnt, &fake_pdu);
return ret;
}
return ret;
return fake_pdu.offset;
}
EXPORT_SYMBOL(p9stat_read);