udf: Check path length when reading symlink
Symlink reading code does not check whether the resulting path fits into
the page provided by the generic code. This isn't as easy as just
checking the symlink size because of various encoding conversions
we perform on path. So we have to check whether there is still enough
space in the buffer on the fly.
CC: stable@vger.kernel.org
Reported-by: Carl Henrik Lunde <chlunde@ping.uio.no>
Signed-off-by: Jan Kara <jack@suse.cz>
Change-Id: Ife76a9ae43172dcec3c39313642d357e45c3781c
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index eb8bfe2..d823c8e 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -163,7 +163,8 @@
struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
- flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
+ flen = udf_get_filename(dir->i_sb, nameptr, lfi, fname,
+ UDF_NAME_LEN);
dt_type = DT_UNKNOWN;
}