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s390/dump: fix copying to user-space of swapped kdump oldmem
commit3b90954419
upstream. This commit fixes a bug introduced by commite9e7870f90
("s390/dump: introduce boot data 'oldmem_data'"). OLDMEM_BASE was mistakenly replaced by oldmem_data.size instead of oldmem_data.start. This bug caused the following error during kdump: kdump.sh[878]: No program header covering vaddr 0x3434f5245found kexec bug? Fixes:e9e7870f90
("s390/dump: introduce boot data 'oldmem_data'") Cc: stable@vger.kernel.org # 5.15+ Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 2 additions and 2 deletions
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@ -191,8 +191,8 @@ static int copy_oldmem_user(void __user *dst, void *src, size_t count)
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return rc;
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} else {
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/* Check for swapped kdump oldmem areas */
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if (oldmem_data.start && from - oldmem_data.size < oldmem_data.size) {
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from -= oldmem_data.size;
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if (oldmem_data.start && from - oldmem_data.start < oldmem_data.size) {
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from -= oldmem_data.start;
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len = min(count, oldmem_data.size - from);
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} else if (oldmem_data.start && from < oldmem_data.size) {
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len = min(count, oldmem_data.size - from);
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