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Input: hideep - fix the uninitialized use in hideep_nvm_unlock()

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[ 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 <yzhai003@ucr.edu>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yizhuo Zhai 2021-06-19 22:26:50 -07:00 committed by Greg Kroah-Hartman
parent a50b56ffc0
commit 90cd79aa9a
1 changed files with 10 additions and 3 deletions
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13
drivers/input/touchscreen/hideep.c
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@ -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);