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authorColin Ian King <colin.king@canonical.com>2021-02-23 22:38:21 +0300
committerKrzysztof Kozlowski <krzk@kernel.org>2021-03-07 22:55:00 +0300
commite004c3e67b6459c99285b18366a71af467d869f5 (patch)
treeb2ef0f709f7aabb255a5982e0f09b95a00d60b9d /drivers/memory/omap-gpmc.c
parenta38fd8748464831584a19438cbb3082b5a2dab15 (diff)
downloadlinux-e004c3e67b6459c99285b18366a71af467d869f5.tar.xz
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/omap-gpmc.c')
-rw-r--r--drivers/memory/omap-gpmc.c7
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);