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befs: Validate length of long symbolic links.

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Signed-off-by: Timo Warns <warns@pre-sense.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Timo Warns 2011-08-17 17:59:56 +02:00 committed by Linus Torvalds
parent b4fd4ae6c6
commit 338d0f0a6f
1 changed files with 14 additions and 9 deletions
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5
fs/befs/linuxvfs.c
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@ -474,6 +474,10 @@ befs_follow_link(struct dentry *dentry, struct nameidata *nd)
befs_data_stream *data = &befs_ino->i_data.ds;
befs_off_t len = data->size;
if (len == 0) {
befs_error(sb, "Long symlink with illegal length");
link = ERR_PTR(-EIO);
} else {
befs_debug(sb, "Follow long symlink");
link = kmalloc(len, GFP_NOFS);
@ -486,6 +490,7 @@ befs_follow_link(struct dentry *dentry, struct nameidata *nd)
} else {
link[len - 1] = '\0';
}
}
} else {
link = befs_ino->i_data.symlink;
}