eepmake: Fix parse_data sscanf #74
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`%2X` format string reads `sizeof(int)` bytes, but only 2 hexadecimal characters are supplied by `c` pointer which is 1 byte long. Using `%2hhX` tells sscanf to read sizeof(char) bytes or 1 byte. On system where sizeof(int) == sizeof(char) this is no issue but on other ones, the arithmetic operation `(unsigned int*)*data+data_len++` is increasing the pointer sizeof(int) bytes instead instead of 1 byte.
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I forgot to emphasis that this issue can lead to a buffer overflow situation. |
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%2Xformat string readssizeof(int)bytes, but only 2 hexadecimal characters are supplied bycpointer which is 1 byte long.Using
%2hhXtells sscanf to read sizeof(char) bytes or 1 byte.On system where sizeof(int) == sizeof(char) this is no issue but on other ones, the arithmetic operation
(unsigned int*)*data+data_len++is increasing the pointer sizeof(int) bytes instead instead of 1 byte.