Fix buffer size warning for strcpy
To meet requirements of Common Criteria certification vulnerability assessment. Static code analysis has been run and found the following error: buffer_size_warning: Calling "strncpy" with a maximum size argument of 16 bytes on destination array "ve->name" of size 16 bytes might leave the destination string unterminated. https://people.redhat.com/ncroxon/mdadm-4.2-rc2-scan-results.html The change is to make the destination size to fit the allocated size. V5: Simplify the the strnlen call. V4: Code cleanup of the interim "if" statement. V3: Doc change only: The code change from filling ve->name with spaces to filling it with null-terminated is to comform to the SNIA - Common RAID Disk Data Format Specification. The format for VD_Name (ve->name) specifies the field to be either ASCII or UNICODE. Bit 2 of the VD_Type field MUST be used to determine the Unicode or ASCII format of this field. If this field is not used, all bytes MUST be set to zero. V2: Change from zero-terminated to zero-padded on memset and change from using strncpy to memcpy, feedback from Neil Brown. Tested-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com> Signed-off-by: Nigel Croxon <ncroxon@redhat.com> Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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@ -2637,9 +2637,11 @@ static int init_super_ddf_bvd(struct supertype *st,
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ve->init_state = DDF_init_not;
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memset(ve->pad1, 0xff, 14);
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memset(ve->name, ' ', 16);
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if (name)
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strncpy(ve->name, name, 16);
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memset(ve->name, '\0', sizeof(ve->name));
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if (name) {
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int l = strnlen(name, sizeof(ve->name));
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memcpy(ve->name, name, l);
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}
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ddf->virt->populated_vdes =
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cpu_to_be16(be16_to_cpu(ddf->virt->populated_vdes)+1);
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