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authorAmerigo Wang <amwang@redhat.com>2009-12-14 17:57:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:10 -0800
commitec81aecb29668ad71f699f4e7b96ec46691895b6 (patch)
tree0a66a8fb41689955e3400cba7fc7419f4183dec5 /fs/hfs/catalog.c
parent4b731d50ff3df6b9141a6c12b088e8eb0109e83c (diff)
hfs: fix a potential buffer overflow
A specially-crafted Hierarchical File System (HFS) filesystem could cause a buffer overflow to occur in a process's kernel stack during a memcpy() call within the hfs_bnode_read() function (at fs/hfs/bnode.c:24). The attacker can provide the source buffer and length, and the destination buffer is a local variable of a fixed length. This local variable (passed as "&entry" from fs/hfs/dir.c:112 and allocated on line 60) is stored in the stack frame of hfs_bnode_read()'s caller, which is hfs_readdir(). Because the hfs_readdir() function executes upon any attempt to read a directory on the filesystem, it gets called whenever a user attempts to inspect any filesystem contents. [amwang@redhat.com: modify this patch and fix coding style problems] Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Eugene Teo <eteo@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Dave Anderson <anderson@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hfs/catalog.c')
-rw-r--r--fs/hfs/catalog.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/hfs/catalog.c b/fs/hfs/catalog.c
index 6d98f116ca0..424b0337f52 100644
--- a/fs/hfs/catalog.c
+++ b/fs/hfs/catalog.c
@@ -289,6 +289,10 @@ int hfs_cat_move(u32 cnid, struct inode *src_dir, struct qstr *src_name,
err = hfs_brec_find(&src_fd);
if (err)
goto out;
+ if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
+ err = -EIO;
+ goto out;
+ }
hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
src_fd.entrylength);