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Using gcc 10 static analysis function reports memory leak in SecGetCharFromFile.
You can learn more about gcc static analysis at https://developers.redhat.com/blog/2020/03/26/static-analysis-in-gcc-10/
To reproduce please run:
gcc-10 -fanalyzer -iquote include -iquote src -MMD -c -o src/libsec.a-secureinput_w.o
Diagnostic message produced:
In file included from src/secureinput_w.c:46:
src/input.inl: In function ‘SecGetCharFromFile’:
src/input.inl:2120:23: warning: leak of ‘<unknown>’ [CWE-401] [-Wanalyzer-malloc-leak]
2120 | if (stream->base == NULL) {
| ~~~~~~^~~~~~
‘SecInputSW’: events 1-3
|
| 1785 | int SecInputSW(SecFileStream *stream, const wchar_t *cFormat, va_list argList)
| | ^~~~~~~~~~
| | |
| | (1) entry to ‘SecInputSW’
|......
| 1809 | while (errRet < 1 && *format != SECUREC_CHAR('\0')) {
| | ~ ~~~~~~~
| | | |
| | | (3) ...to here
| | (2) following ‘true’ branch (when ‘errRet <= 0’)...
|
‘SecInputSW’: events 4-8
|
| 1809 | while (errRet < 1 && *format != SECUREC_CHAR('\0')) {
| 1810 | /* Skip space in format and space in input */
| 1811 | if (SecIsSpace((SecInt)(int)(*format)) != 0) {
| | ~~~~~~~~~
| | |
| | (5) ...to here
|......
| 1821 | if (*format != SECUREC_CHAR('%')) {
| | ~
| | |
| | (6) following ‘true’ branch...
| 1822 | spec.ch = SecGetChar(stream, &(spec.charCount));
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (7) ...to here
| | (8) calling ‘SecGetChar’ from ‘SecInputSW’
|
+--> ‘SecGetChar’: events 9-14
|
| 2152 | SECUREC_INLINE SecInt SecGetChar(SecFileStream *stream, int *counter)
| | ^~~~~~~~~~
| | |
| | (9) entry to ‘SecGetChar’
|......
| 2156 | if ((stream->flag & SECUREC_MEM_STR_FLAG) != 0) {
| | ~
| | |
| | (10) following ‘false’ branch...
|......
| 2162 | if ((stream->flag & SECUREC_FILE_STREAM_FLAG) != 0) {
| | ~ ~~~~~~~~~~~~
| | | |
| | | (11) ...to here
| | (12) following ‘true’ branch...
| 2163 | return SecGetCharFromFile(stream);
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (13) ...to here
| | (14) calling ‘SecGetCharFromFile’ from ‘SecGetChar’
|
+--> ‘SecGetCharFromFile’: events 15-20
|
| 2099 | SECUREC_INLINE SecInt SecGetCharFromFile(SecFileStream *stream)
| | ^~~~~~~~~~~~~~~~~~
| | |
| | (15) entry to ‘SecGetCharFromFile’
|......
| 2102 | if (stream->count < sizeof(SecChar)) {
| | ~
| | |
| | (16) following ‘true’ branch...
|......
| 2105 | if (stream->base != NULL) {
| | ~~~~~~~~~~~~~
| | | |
| | | (17) ...to here
| | (18) following ‘false’ branch...
|......
| 2111 | stream->oriFilePos = ftell(stream->pf); /* Save original file read position */
| | ~~~~~~~~~~~~~~~~~
| | |
| | (19) ...to here
| 2112 | if (stream->oriFilePos == -1) {
| | ~
| | |
| | (20) following ‘false’ branch...
|
‘SecGetCharFromFile’: event 21
|
|src/securecutil.h:304:27:
| 304 | #define SECUREC_MALLOC(x) malloc((size_t)(x))
| | ^~~~~~~~~~~~~~~~~~~
| | |
| | (21) ...to here
src/input.inl:2118:36: note: in expansion of macro ‘SECUREC_MALLOC’
| 2118 | stream->base = (char *)SECUREC_MALLOC(SECUREC_BUFFERED_BLOK_SIZE +
| | ^~~~~~~~~~~~~~
|
‘SecGetCharFromFile’: event 22
|
|src/securecutil.h:304:27:
| 304 | #define SECUREC_MALLOC(x) malloc((size_t)(x))
| | ^~~~~~~~~~~~~~~~~~~
| | |
| | (22) allocated here
src/input.inl:2118:36: note: in expansion of macro ‘SECUREC_MALLOC’
| 2118 | stream->base = (char *)SECUREC_MALLOC(SECUREC_BUFFERED_BLOK_SIZE +
| | ^~~~~~~~~~~~~~
|
‘SecGetCharFromFile’: events 23-28
|
| 2120 | if (stream->base == NULL) {
| | ^~~~~~~~~~~~~
| | | |
| | | (28) ‘<unknown>’ leaks here; was allocated at (22)
| | (23) assuming ‘<unknown>’ is non-NULL
| | (24) following ‘false’ branch...
|......
| 2124 | if (stream->oriFilePos == 0) {
| | ~~~~~~~~~~~~~~~~~~~
| | | |
| | | (25) ...to here
| | (26) following ‘false’ branch...
|......
| 2131 | len = fread(stream->base + stream->count, (size_t)1, (size_t)SECUREC_BUFFERED_BLOK_SIZE, stream->pf);
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (27) ...to here
|
src/input.inl:2124:23: warning: leak of ‘<unknown>’ [CWE-401] [-Wanalyzer-malloc-leak]
2124 | if (stream->oriFilePos == 0) {
| ~~~~~~^~~~~~~~~~~~
‘SecInputSW’: events 1-3
|
| 1785 | int SecInputSW(SecFileStream *stream, const wchar_t *cFormat, va_list argList)
| | ^~~~~~~~~~
| | |
| | (1) entry to ‘SecInputSW’
|......
| 1809 | while (errRet < 1 && *format != SECUREC_CHAR('\0')) {
| | ~ ~~~~~~~
| | | |
| | | (3) ...to here
| | (2) following ‘true’ branch (when ‘errRet <= 0’)...
|
‘SecInputSW’: events 4-8
|
| 1809 | while (errRet < 1 && *format != SECUREC_CHAR('\0')) {
| 1810 | /* Skip space in format and space in input */
| 1811 | if (SecIsSpace((SecInt)(int)(*format)) != 0) {
| | ~~~~~~~~~
| | |
| | (5) ...to here
|......
| 1821 | if (*format != SECUREC_CHAR('%')) {
| | ~
| | |
| | (6) following ‘true’ branch...
| 1822 | spec.ch = SecGetChar(stream, &(spec.charCount));
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (7) ...to here
| | (8) calling ‘SecGetChar’ from ‘SecInputSW’
|
+--> ‘SecGetChar’: events 9-14
|
| 2152 | SECUREC_INLINE SecInt SecGetChar(SecFileStream *stream, int *counter)
| | ^~~~~~~~~~
| | |
| | (9) entry to ‘SecGetChar’
|......
| 2156 | if ((stream->flag & SECUREC_MEM_STR_FLAG) != 0) {
| | ~
| | |
| | (10) following ‘false’ branch...
|......
| 2162 | if ((stream->flag & SECUREC_FILE_STREAM_FLAG) != 0) {
| | ~ ~~~~~~~~~~~~
| | | |
| | | (11) ...to here
| | (12) following ‘true’ branch...
| 2163 | return SecGetCharFromFile(stream);
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (13) ...to here
| | (14) calling ‘SecGetCharFromFile’ from ‘SecGetChar’
|
+--> ‘SecGetCharFromFile’: events 15-20
|
| 2099 | SECUREC_INLINE SecInt SecGetCharFromFile(SecFileStream *stream)
| | ^~~~~~~~~~~~~~~~~~
| | |
| | (15) entry to ‘SecGetCharFromFile’
|......
| 2102 | if (stream->count < sizeof(SecChar)) {
| | ~
| | |
| | (16) following ‘true’ branch...
|......
| 2105 | if (stream->base != NULL) {
| | ~~~~~~~~~~~~~
| | | |
| | | (17) ...to here
| | (18) following ‘false’ branch...
|......
| 2111 | stream->oriFilePos = ftell(stream->pf); /* Save original file read position */
| | ~~~~~~~~~~~~~~~~~
| | |
| | (19) ...to here
| 2112 | if (stream->oriFilePos == -1) {
| | ~
| | |
| | (20) following ‘false’ branch...
|
‘SecGetCharFromFile’: event 21
|
|src/securecutil.h:304:27:
| 304 | #define SECUREC_MALLOC(x) malloc((size_t)(x))
| | ^~~~~~~~~~~~~~~~~~~
| | |
| | (21) ...to here
src/input.inl:2118:36: note: in expansion of macro ‘SECUREC_MALLOC’
| 2118 | stream->base = (char *)SECUREC_MALLOC(SECUREC_BUFFERED_BLOK_SIZE +
| | ^~~~~~~~~~~~~~
|
‘SecGetCharFromFile’: event 22
|
|src/securecutil.h:304:27:
| 304 | #define SECUREC_MALLOC(x) malloc((size_t)(x))
| | ^~~~~~~~~~~~~~~~~~~
| | |
| | (22) allocated here
src/input.inl:2118:36: note: in expansion of macro ‘SECUREC_MALLOC’
| 2118 | stream->base = (char *)SECUREC_MALLOC(SECUREC_BUFFERED_BLOK_SIZE +
| | ^~~~~~~~~~~~~~
|
‘SecGetCharFromFile’: events 23-29
|
| 2120 | if (stream->base == NULL) {
| | ~~~~~~~^~~~~~
| | | |
| | | (23) allocated here
| | (24) assuming ‘<unknown>’ is non-NULL
| | (25) following ‘false’ branch...
|......
| 2124 | if (stream->oriFilePos == 0) {
| | ~~~~~~~~~~~~~~~~~~~
| | | |
| | | (26) ...to here
| | | (29) ‘<unknown>’ leaks here; was allocated at (23)
| | (27) following ‘false’ branch...
|......
| 2131 | len = fread(stream->base + stream->count, (size_t)1, (size_t)SECUREC_BUFFERED_BLOK_SIZE, stream->pf);
| | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| | |
| | (28) ...to here
|
这个函数入口是SecInputS，在这个函数执行的最后阶段，会调用SecAdjustStream(stream);这个接口，在这个接口中会进行释放。
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