s390/kexec: fix return code handling

kexec_file_add_ipl_report ignores that ipl_report_finish may fail and
can return an error pointer instead of a valid pointer.
Fix this and simplify by returning NULL in case of an error and let
the only caller handle this case.

Fixes: 99feaa717e55 ("s390/kexec_file: Create ipl report and pass to next kernel")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index e2cc35775b99670d02e30a99b6e8c020ccbecc84..5ad1dde23dc59cf78aba25df665143434ba0fb59 100644 (file)
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -2156,7 +2156,7 @@ void *ipl_report_finish(struct ipl_report *report)
 
        buf = vzalloc(report->size);
        if (!buf)
-               return ERR_PTR(-ENOMEM);
+               goto out;
        ptr = buf;
 
        memcpy(ptr, report->ipib, report->ipib->hdr.len);
@@ -2195,6 +2195,7 @@ void *ipl_report_finish(struct ipl_report *report)
        }
 
        BUG_ON(ptr > buf + report->size);
+out:
        return buf;
 }
 

diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index 528edff085d9ab8d3efaa56f2dbf9a7a8ac4d059..f0200b503f94d0cdcc516e785009d3ada2646a07 100644 (file)
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -170,6 +170,7 @@ static int kexec_file_add_ipl_report(struct kimage *image,
        struct kexec_buf buf;
        unsigned long addr;
        void *ptr, *end;
+       int ret;
 
        buf.image = image;
 
@@ -199,7 +200,10 @@ static int kexec_file_add_ipl_report(struct kimage *image,
                ptr += len;
        }
 
+       ret = -ENOMEM;
        buf.buffer = ipl_report_finish(data->report);
+       if (!buf.buffer)
+               goto out;
        buf.bufsz = data->report->size;
        buf.memsz = buf.bufsz;
 
@@ -209,7 +213,9 @@ static int kexec_file_add_ipl_report(struct kimage *image,
                data->kernel_buf + offsetof(struct lowcore, ipl_parmblock_ptr);
        *lc_ipl_parmblock_ptr = (__u32)buf.mem;
 
-       return kexec_add_buffer(&buf);
+       ret = kexec_add_buffer(&buf);
+out:
+       return ret;
 }
 
 void *kexec_file_add_components(struct kimage *image,