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| author | Colin Ian King <colin.king@canonical.com> | 2020-07-14 20:22:11 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-07-22 15:02:33 +0200 |
| commit | dee9d154f40c58d02f69acdaa5cfd1eae6ebc28b (patch) | |
| tree | 07c86380271daa87dd0f29c135653912820639a9 /drivers/iommu/omap-iommu-debug.c | |
| parent | f512eefc9bf94e4f943c95833518bdbc80c93f0e (diff) | |
| download | linux-dee9d154f40c58d02f69acdaa5cfd1eae6ebc28b.tar.bz2 | |
iommu/omap: Check for failure of a call to omap_iommu_dump_ctx
It is possible for the call to omap_iommu_dump_ctx to return
a negative error number, so check for the failure and return
the error number rather than pass the negative value to
simple_read_from_buffer.
Fixes: 14e0e6796a0d ("OMAP: iommu: add initial debugfs support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200714192211.744776-1-colin.king@canonical.com
Addresses-Coverity: ("Improper use of negative value")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/omap-iommu-debug.c')
| -rw-r--r-- | drivers/iommu/omap-iommu-debug.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c index 8e19bfa94121..a99afb5d9011 100644 --- a/drivers/iommu/omap-iommu-debug.c +++ b/drivers/iommu/omap-iommu-debug.c @@ -98,8 +98,11 @@ static ssize_t debug_read_regs(struct file *file, char __user *userbuf, mutex_lock(&iommu_debug_lock); bytes = omap_iommu_dump_ctx(obj, p, count); + if (bytes < 0) + goto err; bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes); +err: mutex_unlock(&iommu_debug_lock); kfree(buf); |