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input: fix stack overflow

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fixes #12287, #11788
This commit is contained in:
erw7 2020-05-25 12:48:17 +09:00
parent 37ee95504e
commit 237c9da666
1 changed files with 9 additions and 2 deletions
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11
src/nvim/os/input.c
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@ -188,8 +188,15 @@ size_t input_enqueue(String keys)
char *ptr = keys.data;
char *end = ptr + keys.size;
while (rbuffer_space(input_buffer) >= 6 && ptr < end) {
uint8_t buf[6] = { 0 };
while (rbuffer_space(input_buffer) >= 19 && ptr < end) {
// A "\<x>" form occupies at least 1 characters, and produces up
// to 19 characters (1 + 5 * 3 for the char and 3 for a modifier).
// In the case of K_SPECIAL(0x80) or CSI(0x9B), 3 bytes are escaped and
// needed, but since the keys are UTF-8, so the first byte cannot be
// K_SPECIAL(0x80) or CSI(0x9B).
// In UTF-8, a 5-6 byte representation is now an invalid sequence, but we
// reserve a 19-byte buffer for maximum security.
uint8_t buf[19] = { 0 };
unsigned int new_size
= trans_special((const uint8_t **)&ptr, (size_t)(end - ptr), buf, true,
false);