51 lines
1.5 KiB
Diff
51 lines
1.5 KiB
Diff
From: Timo Warns <Warns@pre-sense.de>
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Date: Wed, 17 Aug 2011 17:59:56 +0200
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Subject: befs: Validate length of long symbolic links.
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From: Timo Warns <Warns@pre-sense.de>
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commit 338d0f0a6fbc82407864606f5b64b75aeb3c70f2 upstream.
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Signed-off-by: Timo Warns <warns@pre-sense.de>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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---
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fs/befs/linuxvfs.c | 23 ++++++++++++++---------
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1 file changed, 14 insertions(+), 9 deletions(-)
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--- a/fs/befs/linuxvfs.c
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+++ b/fs/befs/linuxvfs.c
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@@ -474,17 +474,22 @@ befs_follow_link(struct dentry *dentry,
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befs_data_stream *data = &befs_ino->i_data.ds;
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befs_off_t len = data->size;
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- befs_debug(sb, "Follow long symlink");
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-
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- link = kmalloc(len, GFP_NOFS);
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- if (!link) {
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- link = ERR_PTR(-ENOMEM);
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- } else if (befs_read_lsymlink(sb, data, link, len) != len) {
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- kfree(link);
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- befs_error(sb, "Failed to read entire long symlink");
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+ if (len == 0) {
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+ befs_error(sb, "Long symlink with illegal length");
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link = ERR_PTR(-EIO);
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} else {
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- link[len - 1] = '\0';
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+ befs_debug(sb, "Follow long symlink");
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+
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+ link = kmalloc(len, GFP_NOFS);
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+ if (!link) {
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+ link = ERR_PTR(-ENOMEM);
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+ } else if (befs_read_lsymlink(sb, data, link, len) != len) {
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+ kfree(link);
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+ befs_error(sb, "Failed to read entire long symlink");
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+ link = ERR_PTR(-EIO);
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+ } else {
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+ link[len - 1] = '\0';
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+ }
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}
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} else {
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link = befs_ino->i_data.symlink;
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