[PATCH AUTOSEL 5.4 47/63] Input: hideep - fix the uninitialized use in hideep_nvm_unlock()
From: Sasha Levin <sashal@kernel.org>
Date: 2021-07-10 02:34:17
Also in:
linux-input, lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
From: Yizhuo Zhai <redacted> [ Upstream commit cac7100d4c51c04979dacdfe6c9a5e400d3f0a27 ] Inside function hideep_nvm_unlock(), variable "unmask_code" could be uninitialized if hideep_pgm_r_reg() returns error, however, it is used in the later if statement after an "and" operation, which is potentially unsafe. Signed-off-by: Yizhuo <redacted> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/input/touchscreen/hideep.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/hideep.c b/drivers/input/touchscreen/hideep.c
index ddad4a82a5e5..e9547ee29756 100644
--- a/drivers/input/touchscreen/hideep.c
+++ b/drivers/input/touchscreen/hideep.c@@ -361,13 +361,16 @@ static int hideep_enter_pgm(struct hideep_ts *ts) return -EIO; } -static void hideep_nvm_unlock(struct hideep_ts *ts) +static int hideep_nvm_unlock(struct hideep_ts *ts) { u32 unmask_code; + int error; hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE); - hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code); + error = hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code); hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE); + if (error) + return error; /* make it unprotected code */ unmask_code &= ~HIDEEP_PROT_MODE;
@@ -384,6 +387,8 @@ static void hideep_nvm_unlock(struct hideep_ts *ts) NVM_W_SFR(HIDEEP_NVM_MASK_OFS, ts->nvm_mask); SET_FLASH_HWCONTROL(); hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE); + + return 0; } static int hideep_check_status(struct hideep_ts *ts)
@@ -462,7 +467,9 @@ static int hideep_program_nvm(struct hideep_ts *ts, u32 addr = 0; int error; - hideep_nvm_unlock(ts); + error = hideep_nvm_unlock(ts); + if (error) + return error; while (ucode_len > 0) { xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
--
2.30.2