redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

iommu/omap: Check for failure of a call to omap_iommu_dump_ctx 

[ Upstream commit dee9d154f4 ]

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: 14e0e6796a ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Colin Ian King 2020-07-14 20:22:11 +01:00 committed by Greg Kroah-Hartman
parent 34c920e2c8
commit a31ac41019
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/iommu/omap-iommu-debug.c
View File

@ -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);