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bpf: Use safer kvmalloc_array() where possible 

The kvmalloc_array() function is safer because it has a check for
integer overflows.  These sizes come from the user and I was not
able to see any bounds checking so an integer overflow seems like a
realistic concern.

Fixes: 0dcac27254 ("bpf: Add multi kprobe link")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/Yo9VRVMeHbALyjUH@kili
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Dan Carpenter 2022-05-26 13:24:05 +03:00 committed by Alexei Starovoitov
parent 10f3b29c65
commit fd58f7df24
1 changed files with 4 additions and 4 deletions
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8
kernel/trace/bpf_trace.c
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@ -2263,11 +2263,11 @@ static int copy_user_syms(struct user_syms *us, unsigned long __user *usyms, u32
int err = -ENOMEM;
unsigned int i;
syms = kvmalloc(cnt * sizeof(*syms), GFP_KERNEL);
syms = kvmalloc_array(cnt, sizeof(*syms), GFP_KERNEL);
if (!syms)
goto error;
buf = kvmalloc(cnt * KSYM_NAME_LEN, GFP_KERNEL);
buf = kvmalloc_array(cnt, KSYM_NAME_LEN, GFP_KERNEL);
if (!buf)
goto error;
@ -2464,7 +2464,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
return -EINVAL;
size = cnt * sizeof(*addrs);
addrs = kvmalloc(size, GFP_KERNEL);
addrs = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL);
if (!addrs)
return -ENOMEM;
@ -2489,7 +2489,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
ucookies = u64_to_user_ptr(attr->link_create.kprobe_multi.cookies);
if (ucookies) {
cookies = kvmalloc(size, GFP_KERNEL);
cookies = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL);
if (!cookies) {
err = -ENOMEM;
goto error;