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libssh2: set length to 0 if strdup failed

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Internally, libssh2 dereferences the NULL pointer if length is non-zero.
The callback function cannot return the error condition, so at least
prevent subsequent crash.

Closes #13213
This commit is contained in:
Tobias Stoeckmann 2024-03-28 00:38:09 +01:00 • committed by Daniel Stenberg
parent 4ad9d29705
commit 6f32048200
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1 changed files with 2 additions and 1 deletions
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3
lib/vssh/libssh2.c
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@ -201,7 +201,8 @@ kbd_callback(const char *name, int name_len, const char *instruction,
if(num_prompts == 1) {
struct connectdata *conn = data->conn;
responses[0].text = strdup(conn->passwd);
responses[0].length = curlx_uztoui(strlen(conn->passwd));
responses[0].length =
responses[0].text == NULL ? 0 : curlx_uztoui(strlen(conn->passwd));
}
(void)prompts;
} /* kbd_callback */