path: root/fs/splice.c
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authorAl Viro <viro@zeniv.linux.org.uk>2016-05-05 16:25:35 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-07 22:52:39 -0400
commit99d825822eade8d827a1817357cbf3f889a552d6 (patch)
tree7861ddb5ed4b9c4b72a94e272b646ce9db64a71c /fs/splice.c
parentecryptfs: fix handling of directory opening (diff)
get_rock_ridge_filename(): handle malformed NM entries
Payloads of NM entries are not supposed to contain NUL. When we run into such, only the part prior to the first NUL goes into the concatenation (i.e. the directory entry name being encoded by a bunch of NM entries). We do stop when the amount collected so far + the claimed amount in the current NM entry exceed 254. So far, so good, but what we return as the total length is the sum of *claimed* sizes, not the actual amount collected. And that can grow pretty large - not unlimited, since you'd need to put CE entries in between to be able to get more than the maximum that could be contained in one isofs directory entry / continuation chunk and we are stop once we'd encountered 32 CEs, but you can get about 8Kb easily. And that's what will be passed to readdir callback as the name length. 8Kb __copy_to_user() from a buffer allocated by __get_free_page() Cc: stable@vger.kernel.org # 0.98pl6+ (yes, really) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/splice.c')
0 files changed, 0 insertions, 0 deletions