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| author | Joerg Roedel <joerg.roedel@amd.com> | 2012-03-09 16:37:48 +0400 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2012-03-09 16:37:48 +0400 |
| commit | 6e930045abe51013ee3b47eaeb5aef4bc5a35218 (patch) | |
| tree | 205cc19a0b9b41f2bb61e09ac0e6659079ce117d | |
| parent | 8704a1ba4751fc5ffe2289765cb7222b3a1e20d5 (diff) | |
| download | linux-6e930045abe51013ee3b47eaeb5aef4bc5a35218.tar.xz | |
iommu/amd: Fix double free of mem-region in error-path
When ioremap_nocache fails in iommu initialization the code
calls release_mem_region immediatly. But the function is
called again when the propagates into the upper init
functions leading to a double-free. Fix that.
Reported-by: Don Dutile <ddutile@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 75653daf1de1..526652a7385d 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -358,8 +358,6 @@ static void iommu_disable(struct amd_iommu *iommu) */ static u8 * __init iommu_map_mmio_space(u64 address) { - u8 *ret; - if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) { pr_err("AMD-Vi: Can not reserve memory region %llx for mmio\n", address); @@ -367,13 +365,7 @@ static u8 * __init iommu_map_mmio_space(u64 address) return NULL; } - ret = ioremap_nocache(address, MMIO_REGION_LENGTH); - if (ret != NULL) - return ret; - - release_mem_region(address, MMIO_REGION_LENGTH); - - return NULL; + return ioremap_nocache(address, MMIO_REGION_LENGTH); } static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu) |