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[NETFILTER]: nf_conntrack_h323: check range first in sequence extension
Check range before checking STOP flag. This optimization may save a nanosecond or less :) Signed-off-by: Jing Min Zhao <zhaojingmin@vivecode.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -555,15 +555,6 @@ int decode_seq(bitstr_t * bs, field_t * f, char *base, int level)
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/* Decode the extension components */
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for (opt = 0; opt < bmp2_len; opt++, i++, son++) {
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if (i < f->ub && son->attr & STOP) {
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PRINT("%*.s%s\n", (level + 1) * TAB_SIZE, " ",
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son->name);
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return H323_ERROR_STOP;
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}
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if (!((0x80000000 >> opt) & bmp2)) /* Not present */
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continue;
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/* Check Range */
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if (i >= f->ub) { /* Newer Version? */
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CHECK_BOUND(bs, 2);
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@ -573,6 +564,15 @@ int decode_seq(bitstr_t * bs, field_t * f, char *base, int level)
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continue;
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}
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if (son->attr & STOP) {
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PRINT("%*.s%s\n", (level + 1) * TAB_SIZE, " ",
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son->name);
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return H323_ERROR_STOP;
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}
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if (!((0x80000000 >> opt) & bmp2)) /* Not present */
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continue;
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CHECK_BOUND(bs, 2);
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len = get_len(bs);
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CHECK_BOUND(bs, len);
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