From: Colin Ian King <>

Integer index i needs to be a signed int rather than unsigned to avoid
a wrap-around when decrementing in the while loop.  For example, if the
debugfs_create_file fails when i is zero, the current situation will
predecrement i in the while loop, wrapping i to the maximum signed
integer and cause multiple out of bounds reads on dfs_fls[i].d as
the loop interates to zero.

Also add (int) cast to fix warning that the original fix attempted
to fix.

Fixes: 7cc4ef8ed132 ("x86/RAS/mce_amd_inj: Fix some W= warnings")
Signed-off-by: Colin Ian King <>
 arch/x86/ras/mce_amd_inj.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/ras/mce_amd_inj.c b/arch/x86/ras/mce_amd_inj.c
index cd318d9..cb9779a 100644
--- a/arch/x86/ras/mce_amd_inj.c
+++ b/arch/x86/ras/mce_amd_inj.c
@@ -440,7 +440,7 @@ static struct dfs_node {
 static int __init init_mce_inject(void)
-       unsigned int i;
+       int i;
        u64 cap;
        rdmsrl(MSR_IA32_MCG_CAP, cap);
@@ -450,7 +450,7 @@ static int __init init_mce_inject(void)
        if (!dfs_inj)
                return -EINVAL;
-       for (i = 0; i < ARRAY_SIZE(dfs_fls); i++) {
+       for (i = 0; i < (int)ARRAY_SIZE(dfs_fls); i++) {
                dfs_fls[i].d = debugfs_create_file(dfs_fls[i].name,

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