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lib: fix vtysh core when handling questionmark

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When issue vtysh command with ?, the initial buf size for the
element is 16. Then it would loop through each element in the cmd
output vector. If the required size for printing out the next
element is larger than the current buf size, realloc the buf memory
by doubling the current buf size regardless of the actual size
that's needed. This would cause vtysh core when the doubled size
is not enough for the next element.

Signed-off-by: Yuan Yuan <yyuanam@amazon.com>
(cherry picked from commit f8aa257997)
This commit is contained in:
Yuan Yuan 2023-05-30 19:20:09 +00:00 committed by Mergify
parent 8b6859d2e2
commit 97b1935748
1 changed files with 6 additions and 2 deletions
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8
lib/command.c
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@ -742,9 +742,13 @@ char *cmd_variable_comp2str(vector comps, unsigned short cols)
char *item = vector_slot(comps, j);
itemlen = strlen(item);
if (cs + itemlen + AUTOCOMP_INDENT + 3 >= bsz)
buf = XREALLOC(MTYPE_TMP, buf, (bsz *= 2));
size_t next_sz = cs + itemlen + AUTOCOMP_INDENT + 3;
if (next_sz > bsz) {
/* Make sure the buf size is large enough */
bsz = next_sz;
buf = XREALLOC(MTYPE_TMP, buf, bsz);
}
if (lc + itemlen + 1 >= cols) {
cs += snprintf(&buf[cs], bsz - cs, "\n%*s",
AUTOCOMP_INDENT, "");