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-rw-r--r--lib/mprintf.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/mprintf.c b/lib/mprintf.c
index dbedeaa18..2c88aa833 100644
--- a/lib/mprintf.c
+++ b/lib/mprintf.c
@@ -1036,16 +1036,19 @@ static int alloc_addbyter(int output, FILE *data)
infop->len =0;
}
else if(infop->len+1 >= infop->alloc) {
- char *newptr;
+ char *newptr = NULL;
+ size_t newsize = infop->alloc*2;
- newptr = realloc(infop->buffer, infop->alloc*2);
+ /* detect wrap-around or other overflow problems */
+ if(newsize > infop->alloc)
+ newptr = realloc(infop->buffer, newsize);
if(!newptr) {
infop->fail = 1;
return -1; /* fail */
}
infop->buffer = newptr;
- infop->alloc *= 2;
+ infop->alloc = newsize;
}
infop->buffer[ infop->len ] = outc;