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| author | Paul Walmsley <paul@pwsan.com> | 2009-09-03 20:13:53 +0300 |
|---|---|---|
| committer | paul <paul@twilight.(none)> | 2009-09-03 20:13:53 +0300 |
| commit | 5d113262ee9e074e0d36362d878892819bfdeb47 (patch) | |
| tree | d9cf88995c4a672ace8725518d4f1984350a9e26 /arch | |
| parent | 36d568ec055cb3ac4507d38ebabba955cdbb443e (diff) | |
| download | linux-5d113262ee9e074e0d36362d878892819bfdeb47.tar.gz linux-5d113262ee9e074e0d36362d878892819bfdeb47.tar.bz2 linux-5d113262ee9e074e0d36362d878892819bfdeb47.zip | |
OMAP: powerdomain: Fix overflow when doing powerdomain deps lookups.
At the end of the list pd is a pointer to a NULL struct, so checking
if the address == NULL doesn't help here. In fact the original code
will just keep running past the struct to read who knows what in
memory.
This case manifests itself when from clkdms_setup() when enabling auto
idle for a clock domain and the clockdomain usecount is greater than
0. When _clkdm_add_autodeps() tries to add the a dependency that does
not exist in the powerdomain->wkdep_srcs array the for loop will run
past the wkdep_srcs array.
Currently in linux-omap you won't hit this because the not found case
is never executed, unless you start modifying powerdomains and their
wakeup/sleep deps.
Signed-off-by: Mike Chan <mike@android.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap2/powerdomain.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c index 983f1cb676be..66206b6357fc 100644 --- a/arch/arm/mach-omap2/powerdomain.c +++ b/arch/arm/mach-omap2/powerdomain.c @@ -83,7 +83,7 @@ static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm, if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip)) return ERR_PTR(-EINVAL); - for (pd = deps; pd; pd++) { + for (pd = deps; pd->pwrdm_name; pd++) { if (!omap_chip_is(pd->omap_chip)) continue; @@ -96,7 +96,7 @@ static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm, } - if (!pd) + if (!pd->pwrdm_name) return ERR_PTR(-ENOENT); return pd->pwrdm; |