| Issue |
83730
|
| Summary |
No warning reported for buffer overflow in Clang
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
mushenoy
|
Buffer overflow in the below scenario is not detected in Clang.
GCC reports warning for the same program.
Sample program
```
#include <string.h>
char d[3];
void test (int i)
{
const char *s = i < 0 ? "12345678" : "87654321";
strcat (d, s);
}
```
Compilation with Clang:
No warnings reported
```
# clang -c -Wall prog.c
#
```
Compilation with GCC:
```
# gcc -c -Wall prog.c
prog.c: In function test:
prog.c:7:3: warning: strcat writing 9 bytes into a region of size 3 overflows the destination [-Wstringop-overflow=]
7 | strcat (d, s);
| ^~~~~~~~~~~~~
prog.c:3:6: note: destination object d of size 3
3 | char d[3];
| ^
```
Compiler Versions:
```
clang version 16.0.6
gcc (GCC) 13.2.1
```
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