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| author |   Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-07-13 00:29:36 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-16 10:04:11 +0200 |
| commit | b96fba8d5855c3617adbfb43ca4723a808cac954 (patch) | |
| tree | 893160b3923fce357d34268d3b0bdcce6f2e91e3 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | staging: ks7010: call 'hostif_mib_set_request_int' instead of 'hostif_mib_set_request_bool' (diff) | |
| download | linux-dev-b96fba8d5855c3617adbfb43ca4723a808cac954.tar.xz linux-dev-b96fba8d5855c3617adbfb43ca4723a808cac954.zip | |
staging: speakup: fix wraparound in uaccess length check
If softsynthx_read() is called with `count < 3`, `count - 3` wraps, causing
the loop to copy as much data as available to the provided buffer. If
softsynthx_read() is invoked through sys_splice(), this causes an
unbounded kernel write; but even when userspace just reads from it
normally, a small size could cause userspace crashes.
Fixes: 425e586cf95b ("speakup: add unicode variant of /dev/softsynth")
Cc: stable@vger.kernel.org
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions