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authorNaohiro Aota <naota@elisp.net>2011-07-12 02:54:13 +0900
committerChristoph Hellwig <hch@lst.de>2011-07-22 16:36:56 +0200
commitaac4e4198eff7f9551d586c55342403d49249d95 (patch)
tree9fadb2150044176f1585133d0cf2711c737ddd99 /fs/hfsplus/brec.c
parentdd7f3d5458e5c0eded620fe8192abe7e418fc94c (diff)
hfsplus: Add additional range check to handle on-disk corruptions
'recoff' is read from disk and used for an argument to memcpy, so if the value read from disk is larger than the page size, it result to "general protection fault". This patch add additional range check for the value, so that disk fuzz won't cause such fault. Signed-off-by: Naohiro Aota <naota@elisp.net> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/hfsplus/brec.c')
-rw-r--r--fs/hfsplus/brec.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/hfsplus/brec.c b/fs/hfsplus/brec.c
index 2312de34bd4..2a734cfccc9 100644
--- a/fs/hfsplus/brec.c
+++ b/fs/hfsplus/brec.c
@@ -43,6 +43,10 @@ u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
node->tree->node_size - (rec + 1) * 2);
if (!recoff)
return 0;
+ if (recoff > node->tree->node_size - 2) {
+ printk(KERN_ERR "hfs: recoff %d too large\n", recoff);
+ return 0;
+ }
retval = hfs_bnode_read_u16(node, recoff) + 2;
if (retval > node->tree->max_key_len + 2) {