misc: fastrpc: fix memory corruption on open
authorJohan Hovold <johan+linaro@kernel.org>
Mon, 29 Aug 2022 08:05:30 +0000 (10:05 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 8 Sep 2022 10:28:04 +0000 (12:28 +0200)
commitcf20c3533efc89578ace94fa20a9e63446223c72
treef9e31dca8154c0df81c63b6a63901d5cec09935a
parent0e33b0f322fecd7a92d9dc186535cdf97940a856
misc: fastrpc: fix memory corruption on open

commit d245f43aab2b61195d8ebb64cef7b5a08c590ab4 upstream.

The probe session-duplication overflow check incremented the session
count also when there were no more available sessions so that memory
beyond the fixed-size slab-allocated session array could be corrupted in
fastrpc_session_alloc() on open().

Fixes: f6f9279f2bf0 ("misc: fastrpc: Add Qualcomm fastrpc basic driver model")
Cc: stable@vger.kernel.org # 5.1
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220829080531.29681-3-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/misc/fastrpc.c