diff options
| author |   Colin Ian King <colin.king@canonical.com> | 2021-02-23 19:38:21 +0000 |
|---|---|---|
| committer |   Krzysztof Kozlowski <krzk@kernel.org> | 2021-03-07 20:55:00 +0100 |
| commit | e004c3e67b6459c99285b18366a71af467d869f5 (patch) | |
| tree | b2ef0f709f7aabb255a5982e0f09b95a00d60b9d /drivers/memory | |
| parent | Linux 5.12-rc2 (diff) | |
| download | linux-dev-e004c3e67b6459c99285b18366a71af467d869f5.tar.xz linux-dev-e004c3e67b6459c99285b18366a71af467d869f5.zip | |
memory: gpmc: fix out of bounds read and dereference on gpmc_cs[]
Currently the array gpmc_cs is indexed by cs before it cs is range checked
and the pointer read from this out-of-index read is dereferenced. Fix this
by performing the range check on cs before the read and the following
pointer dereference.
Addresses-Coverity: ("Negative array index read")
Fixes: 9ed7a776eb50 ("ARM: OMAP2+: Fix support for multiple devices on a GPMC chip select")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210223193821.17232-1-colin.king@canonical.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/omap-gpmc.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c index cfa730cfd145..f80c2ea39ca4 100644 --- a/drivers/memory/omap-gpmc.c +++ b/drivers/memory/omap-gpmc.c @@ -1009,8 +1009,8 @@ EXPORT_SYMBOL(gpmc_cs_request); void gpmc_cs_free(int cs) { - struct gpmc_cs_data *gpmc = &gpmc_cs[cs]; - struct resource *res = &gpmc->mem; + struct gpmc_cs_data *gpmc; + struct resource *res; spin_lock(&gpmc_mem_lock); if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) { @@ -1018,6 +1018,9 @@ void gpmc_cs_free(int cs) spin_unlock(&gpmc_mem_lock); return; } + gpmc = &gpmc_cs[cs]; + res = &gpmc->mem; + gpmc_cs_disable_mem(cs); if (res->flags) release_resource(res); |