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| author | Colin Ian King <colin.king@canonical.com> | 2017-03-20 14:51:23 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2017-04-19 22:00:13 +0300 |
| commit | c7f82ea8605627b3088f166d9f4a5ca7857e8383 (patch) | |
| tree | 237b2399914d3db7e9e268cb23b1a84ecdf90542 /drivers/i2c | |
| parent | bd698d24b1b5790d0a22d44a0705dabd47235ad4 (diff) | |
| download | linux-c7f82ea8605627b3088f166d9f4a5ca7857e8383.tar.xz | |
i2c: designware-baytrail: fix potential null pointer dereference on dev
The assignment to addr requires a call to get_sem_addr that dereferences
dev, however, this dereference occurs before a null pointer check on dev.
Move this assignment after the null check on dev to avoid a potential null
pointer dereference.
Detected by CoverityScan, CID#1419700 ("Dereference before null check")
Fixes: fd476fa22a1f432 ("i2c: designware-baytrail: Add support for cherrytrail")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-baytrail.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-designware-baytrail.c b/drivers/i2c/busses/i2c-designware-baytrail.c index 1ac042972020..dbda8c9c8a1c 100644 --- a/drivers/i2c/busses/i2c-designware-baytrail.c +++ b/drivers/i2c/busses/i2c-designware-baytrail.c @@ -70,7 +70,7 @@ static void reset_semaphore(struct dw_i2c_dev *dev) static int baytrail_i2c_acquire(struct dw_i2c_dev *dev) { - u32 addr = get_sem_addr(dev); + u32 addr; u32 sem = PUNIT_SEMAPHORE_ACQUIRE; int ret; unsigned long start, end; @@ -94,6 +94,8 @@ static int baytrail_i2c_acquire(struct dw_i2c_dev *dev) */ pm_qos_update_request(&dev->pm_qos, 0); + addr = get_sem_addr(dev); + /* host driver writes to side band semaphore register */ ret = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE, addr, sem); if (ret) { |