34 lines
949 B
Diff
34 lines
949 B
Diff
From: Miklos Szeredi <mszeredi@suse.cz>
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Date: Wed, 24 Aug 2011 10:20:17 +0200
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Subject: fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message
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From: Miklos Szeredi <mszeredi@suse.cz>
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commit c2183d1e9b3f313dd8ba2b1b0197c8d9fb86a7ae upstream.
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FUSE_NOTIFY_INVAL_ENTRY didn't check the length of the write so the
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message processing could overrun and result in a "kernel BUG at
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fs/fuse/dev.c:629!"
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Reported-by: Han-Wen Nienhuys <hanwenn@gmail.com>
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Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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---
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fs/fuse/dev.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/fs/fuse/dev.c
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+++ b/fs/fuse/dev.c
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@@ -1358,6 +1358,10 @@ static int fuse_notify_inval_entry(struc
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if (outarg.namelen > FUSE_NAME_MAX)
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goto err;
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+ err = -EINVAL;
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+ if (size != sizeof(outarg) + outarg.namelen + 1)
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+ goto err;
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+
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name.name = buf;
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name.len = outarg.namelen;
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err = fuse_copy_one(cs, buf, outarg.namelen + 1);
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