David Howells 9f8d0dc0ec kcm: Fix unnecessary psock unreservation. ... kcm_write_msgs() calls unreserve_psock() to release its hold on the underlying TCP socket if it has run out of things to transmit, but if we have nothing in the write queue on entry (e.g. because someone did a zero-length sendmsg), we don't actually go into the transmission loop and as a consequence don't call reserve_psock(). Fix this by skipping the call to unreserve_psock() if we didn't reserve a psock. Fixes: c31a25e1db ("kcm: Send multiple frags in one sendmsg()") Reported-by: syzbot+dd1339599f1840e4cc65@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/000000000000a61ffe05fe0c3d08@google.com/ Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: syzbot+dd1339599f1840e4cc65@syzkaller.appspotmail.com cc: Tom Herbert <tom@herbertland.com> cc: Tom Herbert <tom@quantonium.net> cc: Jens Axboe <axboe@kernel.dk> cc: Matthew Wilcox <willy@infradead.org> Link: https://lore.kernel.org/r/20787.1686828722@warthog.procyon.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2023-06-17 00:08:27 -07:00
..
kcmproc.c	net: kcm: kcmproc.c: Fix RCU list suspicious usage warning	2020-03-16 17:14:02 -07:00
kcmsock.c	kcm: Fix unnecessary psock unreservation.	2023-06-17 00:08:27 -07:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
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