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| author | Michael Jones <michael.jones@matrix-vision.de> | 2011-03-09 09:17:32 (GMT) |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2011-03-14 16:17:07 (GMT) |
| commit | 4359d38d518c0dd72c03a3bc9918607ba8f2648a (patch) | |
| tree | c201e8c56eaf003bc6c25f041c1e734d711d9e68 /arch | |
| parent | 42924355204bd83d799bd151211ae6e014982849 (diff) | |
| download | linux-4359d38d518c0dd72c03a3bc9918607ba8f2648a.tar.xz | |
omap: iovmm: disallow mapping NULL address when IOVMF_DA_ANON is set
commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping the NULL
address if da_start==0, which would then not get unmapped. Disallow
this again if IOVMF_DA_ANON is set. And spell variable 'alignment'
correctly.
Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-omap/iovmm.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c index 6dc1296..ea7eab9 100644 --- a/arch/arm/plat-omap/iovmm.c +++ b/arch/arm/plat-omap/iovmm.c @@ -271,20 +271,21 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, size_t bytes, u32 flags) { struct iovm_struct *new, *tmp; - u32 start, prev_end, alignement; + u32 start, prev_end, alignment; if (!obj || !bytes) return ERR_PTR(-EINVAL); start = da; - alignement = PAGE_SIZE; + alignment = PAGE_SIZE; if (flags & IOVMF_DA_ANON) { - start = obj->da_start; + /* Don't map address 0 */ + start = obj->da_start ? obj->da_start : alignment; if (flags & IOVMF_LINEAR) - alignement = iopgsz_max(bytes); - start = roundup(start, alignement); + alignment = iopgsz_max(bytes); + start = roundup(start, alignment); } else if (start < obj->da_start || start > obj->da_end || obj->da_end - start < bytes) { return ERR_PTR(-EINVAL); @@ -304,7 +305,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, goto found; if (tmp->da_end >= start && flags & IOVMF_DA_ANON) - start = roundup(tmp->da_end + 1, alignement); + start = roundup(tmp->da_end + 1, alignment); prev_end = tmp->da_end; } |