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| author |   Dmitry Vyukov <dvyukov@google.com> | 2015-09-17 17:17:08 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 19:03:40 +0100 |
| commit | 7098296a362a96051fa120abf48f0095818b99cd (patch) | |
| tree | d5faab1ed808c7fc3d55be88d431452b43e1e63e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | tty: fix stall caused by missing memory barrier in drivers/tty/n_tty.c (diff) | |
| download | linux-dev-7098296a362a96051fa120abf48f0095818b99cd.tar.xz linux-dev-7098296a362a96051fa120abf48f0095818b99cd.zip | |
tty: fix data race in flush_to_ldisc
flush_to_ldisc reads port->itty and checks that it is not NULL,
concurrently release_tty sets port->itty to NULL. It is possible
that flush_to_ldisc loads port->itty once, ensures that it is
not NULL, but then reloads it again and uses. The second load
can already return NULL, which will cause a crash.
Use READ_ONCE to read port->itty.
The data race was found with KernelThreadSanitizer (KTSAN).
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions