This is a note to let you know that I've just added the patch titled IPC: bugfix for msgrcv with msgtyp < 0 to the 3.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ipc-bugfix-for-msgrcv-with-msgtyp-0.patch and it can be found in the queue-3.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 368ae537e056acd3f751fa276f48423f06803922 Mon Sep 17 00:00:00 2001 From: Svenning Soerensen <sss@xxxxxxxxxx> Date: Wed, 28 Aug 2013 16:35:17 -0700 Subject: IPC: bugfix for msgrcv with msgtyp < 0 From: Svenning Soerensen <sss@xxxxxxxxxx> commit 368ae537e056acd3f751fa276f48423f06803922 upstream. According to 'man msgrcv': "If msgtyp is less than 0, the first message of the lowest type that is less than or equal to the absolute value of msgtyp shall be received." Bug: The kernel only returns a message if its type is 1; other messages with type < abs(msgtype) will never get returned. Fix: After having traversed the list to find the first message with the lowest type, we need to actually return that message. This regression was introduced by commit daaf74cf0867 ("ipc: refactor msg list search into separate function") Signed-off-by: Svenning Soerensen <sss@xxxxxxxxxx> Reviewed-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- ipc/msg.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/ipc/msg.c +++ b/ipc/msg.c @@ -795,7 +795,7 @@ static inline void free_copy(struct msg_ static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) { - struct msg_msg *msg; + struct msg_msg *msg, *found = NULL; long count = 0; list_for_each_entry(msg, &msq->q_messages, m_list) { @@ -804,6 +804,7 @@ static struct msg_msg *find_msg(struct m *msgtyp, mode)) { if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) { *msgtyp = msg->m_type - 1; + found = msg; } else if (mode == SEARCH_NUMBER) { if (*msgtyp == count) return msg; @@ -813,7 +814,7 @@ static struct msg_msg *find_msg(struct m } } - return ERR_PTR(-EAGAIN); + return found ?: ERR_PTR(-EAGAIN); } Patches currently in stable-queue which might be from sss@xxxxxxxxxx are queue-3.10/ipc-bugfix-for-msgrcv-with-msgtyp-0.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html