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jsonrpc: fix crash on bad JSON input.

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It went something like:
   niftynei: Hey, cppcheck complains this might be NULL, so I put in a check.
   rusty: cppcheck is dumb.  Make it an assert("Rusty always right!").
   niftynei: You seem certain of this so I shall do that.
             https://github.com/ElementsProject/lightning/pull/1994
   ...
   renepickhardt: I asked fiatjaf to run
                  `lightning-cli sendpay "[{'id':'02db8f487fcc0a'}]" 4efe0ba89b`
                  and his node crashed!
   rusty: grep Assertion logs/*
          lightningd/jsonrpc.c:326: connection_complete_error: Assertion `Rusty is always right!' failed.

It turns out that in the 'can't parse' error case, we hand NULL cmd to
connection_compete_error.

Next time, less asserting, more grepping!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-10-12 12:22:53 +10:30
parent c22d7012a3
commit f6b0f794b2
1 changed files with 3 additions and 2 deletions
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5
lightningd/jsonrpc.c
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@ -279,6 +279,7 @@ static void json_done(struct json_connection *jcon,
struct json_output *out = tal(jcon, struct json_output);
out->json = tal_strdup(out, json);
/* Can be NULL if we failed to parse! */
tal_free(cmd);
/* Queue for writing, and wake writer. */
@ -323,8 +324,8 @@ static void connection_complete_error(struct json_connection *jcon,
assert(id != NULL);
assert(cmd);
if (cmd->ok)
/* cmd *can be* NULL if we failed to parse! */
if (cmd && cmd->ok)
*(cmd->ok) = false;
json_done(jcon, cmd, take(tal_fmt(tmpctx,