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Valgrind: "invalid read size 1" when throwing custom exception


Valgrind: "invalid read size 1" when throwing custom exception

By : Dustin Greiner
Date : November 21 2020, 09:01 AM
Hope that helps
From what I understand, it returns an invalid pointer. But it compiles fine outside of valgrind and prints the right message.
code :


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Valgrind Error: "Invalid read of size 1" due to strstr() with C

Valgrind Error: "Invalid read of size 1" due to strstr() with C


By : M.Reis
Date : March 29 2020, 07:55 AM
I hope this helps . It sounds (from Valgrind's report) as if method is NULL. You should step through this code with a debugger to verify that the tokenizing works as intended.
Also, you should declare all those pointers as const char * since they're not intended to be written to. This is of course a minor point, but I try to encourage use of const whenever possible. :)
Valgrind multiple "invalid write/read of size 1" errors

Valgrind multiple "invalid write/read of size 1" errors


By : jothibasu nagamalai
Date : March 29 2020, 07:55 AM
it fixes the issue My program reads in people from a file and saves their information to a Person structure that looks like this: , You're using the wrong length for the allocation of the second part,
code :
fscanf(fin, "%s", temp2);
p[i].lname = (char *) calloc(strlen(temp)+1, sizeof(char));
strcpy(p[i].lname, temp2);
Why does Valgrind give "Invalid read of size 1" error?

Why does Valgrind give "Invalid read of size 1" error?


By : Dave Holowiski
Date : March 29 2020, 07:55 AM
With these it helps You are returning a c_str-pointer to a std::string that no longer exists: you pop it off the stack and copy its contents to a local variable, then you return the c_str pointer of that local variable, which gets destroyed as the function returns.
As for the solution, why not just return std::string rather than resorting to C strings?
Valgrind - Invalid read of size 1 in a "readline" function implemented in C

Valgrind - Invalid read of size 1 in a "readline" function implemented in C


By : Mry Mrx
Date : March 29 2020, 07:55 AM
I wish this help you I've the following code where basically I implemented my own read-line function for exercising me in memory allocation, etc, in C. Before I asked a question, but no one actually helped in trying to correct my code eventually except for suggesting to use valgrind. Since I'd never used it before, it's quite hard for me to understand everything. , Well, for one: you calloc a new buffer:
code :
tmp = calloc(n, sizeof(char));
for(int i=0; i <= strlen(final); ++i)
   tmp[i] = final[i];
free(final);
Multiple valgrind "invalid read of size n" on working program

Multiple valgrind "invalid read of size n" on working program


By : vmr
Date : March 29 2020, 07:55 AM
This might help you When the string is constructed in the thread_read function, you do not allocate space for a null terminator and write it after the end of the string. As a result, the strlen call in concat reads beyond the end of the allocated memory area.
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