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func_base64.c: Ensure we set aside enough room for base64 encoded data.

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Reported by SingularTricycle on IRC.

Fixes #940
This commit is contained in:
Sean Bright
2024-10-08 15:11:05 -04:00
parent 62b6ea3202
commit fae5d21b6a
1 changed files with 4 additions and 1 deletions
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5
funcs/func_base64.c
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@@ -85,7 +85,10 @@ static int base64_helper(struct ast_channel *chan, const char *cmd, char *data,
ast_base64encode(buf, (unsigned char *) data, strlen(data), len); ast_base64encode(buf, (unsigned char *) data, strlen(data), len);
} else { } else {
if (len >= 0) { if (len >= 0) {
ast_str_make_space(str, len ? len : ast_str_strlen(*str) + strlen(data) * 4 / 3 + 2); /* This calculation accounts for padding and the trailing 0 byte. Borrowed
from utils.c */
size_t bytes_needed_to_encode_data = ((strlen(data) * 4 / 3 + 3) & ~3) + 1;
ast_str_make_space(str, len ? len : ast_str_strlen(*str) + bytes_needed_to_encode_data);
} }
ast_base64encode(ast_str_buffer(*str) + ast_str_strlen(*str), (unsigned char *) data, strlen(data), ast_str_size(*str) - ast_str_strlen(*str)); ast_base64encode(ast_str_buffer(*str) + ast_str_strlen(*str), (unsigned char *) data, strlen(data), ast_str_size(*str) - ast_str_strlen(*str));
ast_str_update(*str); ast_str_update(*str);