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befs: Validate length of long symbolic links.

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commit 338d0f0a6f upstream.

Signed-off-by: Timo Warns <warns@pre-sense.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Timo Warns
2011-08-17 17:59:56 +02:00
committed by Greg Kroah-Hartman
parent b732c7ad1f
commit f10df41393
1 changed files with 14 additions and 9 deletions
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23
fs/befs/linuxvfs.c
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@@ -474,17 +474,22 @@ befs_follow_link(struct dentry *dentry, struct nameidata *nd)
befs_data_stream *data = &befs_ino->i_data.ds;
befs_off_t len = data->size;
befs_debug(sb, "Follow long symlink");
link = kmalloc(len, GFP_NOFS);
if (!link) {
link = ERR_PTR(-ENOMEM);
} else if (befs_read_lsymlink(sb, data, link, len) != len) {
kfree(link);
befs_error(sb, "Failed to read entire long symlink");
if (len == 0) {
befs_error(sb, "Long symlink with illegal length");
link = ERR_PTR(-EIO);
} else {
link[len - 1] = '\0';
befs_debug(sb, "Follow long symlink");
link = kmalloc(len, GFP_NOFS);
if (!link) {
link = ERR_PTR(-ENOMEM);
} else if (befs_read_lsymlink(sb, data, link, len) != len) {
kfree(link);
befs_error(sb, "Failed to read entire long symlink");
link = ERR_PTR(-EIO);
} else {
link[len - 1] = '\0';
}
}
} else {
link = befs_ino->i_data.symlink;