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| author | Timo Warns <Warns@pre-sense.de> | 2011-08-17 17:59:56 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-29 14:08:05 -0700 |
| commit | 0af48fa3a0be99117e19b952c6878ce5409112e4 (patch) | |
| tree | 7382de39978f2720a08b69051b5e4748399c1ca2 | |
| parent | 098c4cab3a9eaf734d7d99feb55a521be90da37d (diff) | |
| download | lwn-0af48fa3a0be99117e19b952c6878ce5409112e4.tar.gz lwn-0af48fa3a0be99117e19b952c6878ce5409112e4.zip | |
befs: Validate length of long symbolic links.
commit 338d0f0a6fbc82407864606f5b64b75aeb3c70f2 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>
| -rw-r--r-- | fs/befs/linuxvfs.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c index 34ddda888e63..9158c07b2bd5 100644 --- a/fs/befs/linuxvfs.c +++ b/fs/befs/linuxvfs.c @@ -469,17 +469,22 @@ 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; |