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curl/add_parallel_transfers: better error handling

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1 - consider the transfer handled at once when in the function, to avoid
    the same list entry to get added more than once in rare error
    situations

2 - set the ERRORBUFFER for the handle first after it has been added
    successfully

Reported-by: Trail of Bits

Closes #9729
This commit is contained in:
Daniel Stenberg 2022-10-12 08:42:57 +02:00
parent 57e2bb52aa
commit f67f60c14b
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GPG key ID: 5CC908FDB71E12C2
1 changed files with 10 additions and 10 deletions
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20
src/tool_operate.c
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@ -2192,17 +2192,15 @@ static CURLcode add_parallel_transfers(struct GlobalConfig *global,
sleeping = TRUE;
continue;
}
per->added = TRUE;
result = pre_transfer(global, per);
if(result)
return result;
errorbuf = per->errorbuffer;
if(!errorbuf) {
errorbuf = malloc(CURL_ERROR_SIZE);
if(!errorbuf)
return CURLE_OUT_OF_MEMORY;
}
errorbuf = malloc(CURL_ERROR_SIZE);
if(!errorbuf)
return CURLE_OUT_OF_MEMORY;
/* parallel connect means that we don't set PIPEWAIT since pipewait
will make libcurl prefer multiplexing */
@ -2212,19 +2210,21 @@ static CURLcode add_parallel_transfers(struct GlobalConfig *global,
(void)curl_easy_setopt(per->curl, CURLOPT_XFERINFOFUNCTION, xferinfo_cb);
(void)curl_easy_setopt(per->curl, CURLOPT_XFERINFODATA, per);
(void)curl_easy_setopt(per->curl, CURLOPT_NOPROGRESS, 0L);
(void)curl_easy_setopt(per->curl, CURLOPT_ERRORBUFFER, errorbuf);
mcode = curl_multi_add_handle(multi, per->curl);
if(mcode) {
free(errorbuf);
return CURLE_OUT_OF_MEMORY;
DEBUGASSERT(mcode == CURLM_OUT_OF_MEMORY);
result = CURLE_OUT_OF_MEMORY;
}
result = create_transfer(global, share, &getadded);
if(!result)
result = create_transfer(global, share, &getadded);
if(result) {
free(errorbuf);
return result;
}
errorbuf[0] = 0;
(void)curl_easy_setopt(per->curl, CURLOPT_ERRORBUFFER, errorbuf);
per->errorbuffer = errorbuf;
per->added = TRUE;
all_added++;