Realloc() needs to allocate one more byte for sprintf() #746
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
In generate_sbat_var_defs.c, realloc() should allocate one more byte for the end of string '\0' when running sprintf() later. Suppose we use fgets() to get line="abc\n", so strlen(line)=4 bytes. realloc(...,strlen(line),1) will allocate 5 bytes which is not capable to save line(3 bytes),'\' and 'n'(2 bytes) pluses extra '\0' byte totally 6 bytes when running sprintf(.....,"%s\\n", line) later on. where '\n' of line has been removed in line[strlen(line) - 1] = 0; Signed-off-by: Dennis Tseng <dennis.tseng@suse.com>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
In generate_sbat_var_defs.c, realloc() should allocate one more byte for the end of string '\0' when running sprintf() later. please also refer #744
Suppose we use fgets() to get line="abc\n", so strlen(line)=4 bytes. realloc(...,strlen(line),1) will allocate only 5 bytes which is not capable to save line(3 bytes),'\' and 'n'(2 bytes) pluses extra '\0' byte totally 6 bytes when running sprintf(.....,"%s\\n", line) later on.
where '\n' of line has been removed in line[strlen(line) - 1] = 0;