jffs2: validate symlink size in jffs2_do_read_inode_internal()

`csize' is read from disk and thus needs validation.  Otherwise a bogus
value 0xffffffff would turn the subsequent kmalloc(csize + 1, ...) into
kmalloc(0, ...), leading to out-of-bounds write.

This patch limits `csize' to JFFS2_MAX_NAME_LEN, which is also used
in jffs2_symlink().

Artem: we actually validate csize by checking CRC, so this 0xFFs cannot
come from empty flash region. But I guess an attacker could feed JFFS2
an image with random csize value, including 0xFFs.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index dc0437e84763..9897f38af707 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -1266,6 +1266,12 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
                         /* Symlink's inode data is the target path. Read it and
                          * keep in RAM to facilitate quick follow symlink
                          * operation. */
+                        uint32_t csize = je32_to_cpu(latest_node->csize);
+                        if (csize > JFFS2_MAX_NAME_LEN) {
+                                mutex_unlock(&f->sem);
+                                jffs2_do_clear_inode(c, f);
+                                return -ENAMETOOLONG;
+                        }
                         f->target = kmalloc(je32_to_cpu(latest_node->csize) + 1, GFP_KERNEL);
                         if (!f->target) {
                                 JFFS2_ERROR("can't allocate %d bytes of memory for the symlink target path cache\n", je32_to_cpu(latest_node->csize));