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powerpc/kprobes: Handle error returned by set_memory_rox()

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set_memory_rox() can fail.

In case it fails, free allocated memory and return NULL.

Link: https://github.com/KSPP/linux/issues/7
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/b4907cf4339bd086abc40430d91311436cb0c18e.1708078401.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2024-02-16 11:13:28 +01:00 • committed by Michael Ellerman
parent 09ca1b1171
commit f7f18e30b4
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/kernel/kprobes.c
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@ -134,10 +134,16 @@ void *alloc_insn_page(void)
if (!page) if (!page)
return NULL; return NULL;
if (strict_module_rwx_enabled()) if (strict_module_rwx_enabled()) {
set_memory_rox((unsigned long)page, 1); int err = set_memory_rox((unsigned long)page, 1);
if (err)
goto error;
}
return page; return page;
error:
module_memfree(page);
return NULL;
} }
int arch_prepare_kprobe(struct kprobe *p) int arch_prepare_kprobe(struct kprobe *p)